vnet/vnet/ip/ip6_forward.c

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip6_forward.c: IP v6 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #include <vnet/vnet.h>
  41 #include <vnet/ip/ip.h>
  42 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
  43 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  44 #include <vppinfra/cache.h>
  45 #include <vnet/fib/fib_table.h>
  46 #include <vnet/fib/ip6_fib.h>
  47 #include <vnet/dpo/load_balance.h>
  48 #include <vnet/dpo/classify_dpo.h>
  49
  50 #include <vppinfra/bihash_template.c>
  51
  52 /**
  53  * @file
  54  * @brief IPv6 Forwarding.
  55  *
  56  * This file contains the source code for IPv6 forwarding.
  57  */
  58
  59 void
  60 ip6_forward_next_trace (vlib_main_t * vm,
  61                         vlib_node_runtime_t * node,
  62                         vlib_frame_t * frame,
  63                         vlib_rx_or_tx_t which_adj_index);
  64
  65 always_inline uword
  66 ip6_lookup_inline (vlib_main_t * vm,
  67                    vlib_node_runtime_t * node,
  68                    vlib_frame_t * frame)
  69 {
  70   ip6_main_t * im = &ip6_main;
  71   vlib_combined_counter_main_t * cm = &load_balance_main.lbm_to_counters;
  72   u32 n_left_from, n_left_to_next, * from, * to_next;
  73   ip_lookup_next_t next;
  74   u32 cpu_index = os_get_cpu_number();
  75
  76   from = vlib_frame_vector_args (frame);
  77   n_left_from = frame->n_vectors;
  78   next = node->cached_next_index;
  79
  80   while (n_left_from > 0)
  81     {
  82       vlib_get_next_frame (vm, node, next,
  83                            to_next, n_left_to_next);
  84
  85       while (n_left_from >= 4 && n_left_to_next >= 2)
  86         {
  87           vlib_buffer_t * p0, * p1;
  88           u32 pi0, pi1, lbi0, lbi1, wrong_next;
  89           ip_lookup_next_t next0, next1;
  90           ip6_header_t * ip0, * ip1;
  91           ip6_address_t * dst_addr0, * dst_addr1;
  92           u32 fib_index0, fib_index1;
  93           u32 flow_hash_config0, flow_hash_config1;
  94           const dpo_id_t *dpo0, *dpo1;
  95           const load_balance_t *lb0, *lb1;
  96
  97           /* Prefetch next iteration. */
  98           {
  99             vlib_buffer_t * p2, * p3;
 100
 101             p2 = vlib_get_buffer (vm, from[2]);
 102             p3 = vlib_get_buffer (vm, from[3]);
 103
 104             vlib_prefetch_buffer_header (p2, LOAD);
 105             vlib_prefetch_buffer_header (p3, LOAD);
 106             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
 107             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
 108           }
 109
 110           pi0 = to_next[0] = from[0];
 111           pi1 = to_next[1] = from[1];
 112
 113           p0 = vlib_get_buffer (vm, pi0);
 114           p1 = vlib_get_buffer (vm, pi1);
 115
 116           ip0 = vlib_buffer_get_current (p0);
 117           ip1 = vlib_buffer_get_current (p1);
 118
 119           dst_addr0 = &ip0->dst_address;
 120           dst_addr1 = &ip1->dst_address;
 121
 122           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 123           fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
 124
 125           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 126             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 127           fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
 128             fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
 129
 130           lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0);
 131           lbi1 = ip6_fib_table_fwding_lookup (im, fib_index1, dst_addr1);
 132
 133           lb0 = load_balance_get (lbi0);
 134           lb1 = load_balance_get (lbi1);
 135
 136           vnet_buffer (p0)->ip.flow_hash =
 137             vnet_buffer(p1)->ip.flow_hash = 0;
 138
 139           if (PREDICT_FALSE(lb0->lb_n_buckets > 1))
 140             {
 141               flow_hash_config0 = lb0->lb_hash_config;
 142               vnet_buffer (p0)->ip.flow_hash =
 143                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 144             }
 145           if (PREDICT_FALSE(lb1->lb_n_buckets > 1))
 146             {
 147               flow_hash_config1 = lb1->lb_hash_config;
 148               vnet_buffer (p1)->ip.flow_hash =
 149                 ip6_compute_flow_hash (ip1, flow_hash_config1);
 150             }
 151
 152           ASSERT (lb0->lb_n_buckets > 0);
 153           ASSERT (lb1->lb_n_buckets > 0);
 154           ASSERT (is_pow2 (lb0->lb_n_buckets));
 155           ASSERT (is_pow2 (lb1->lb_n_buckets));
 156           dpo0 = load_balance_get_bucket_i(lb0,
 157                                            (vnet_buffer (p0)->ip.flow_hash &
 158                                             lb0->lb_n_buckets_minus_1));
 159           dpo1 = load_balance_get_bucket_i(lb1,
 160                                            (vnet_buffer (p1)->ip.flow_hash &
 161                                             lb1->lb_n_buckets_minus_1));
 162
 163           next0 = dpo0->dpoi_next_node;
 164           next1 = dpo1->dpoi_next_node;
 165
 166           /* Only process the HBH Option Header if explicitly configured to do so */
 167           if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 168             {
 169               next0 = (dpo_is_adj(dpo0) && im->hbh_enabled) ?
 170                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 171             }
 172           if (PREDICT_FALSE(ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 173             {
 174               next1 = (dpo_is_adj(dpo1) && im->hbh_enabled) ?
 175                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next1;
 176             }
 177           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 178           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
 179
 180           vlib_increment_combined_counter
 181               (cm, cpu_index, lbi0, 1,
 182                vlib_buffer_length_in_chain (vm, p0));
 183           vlib_increment_combined_counter
 184               (cm, cpu_index, lbi1, 1,
 185                vlib_buffer_length_in_chain (vm, p1));
 186
 187           from += 2;
 188           to_next += 2;
 189           n_left_to_next -= 2;
 190           n_left_from -= 2;
 191
 192           wrong_next = (next0 != next) + 2*(next1 != next);
 193           if (PREDICT_FALSE (wrong_next != 0))
 194             {
 195               switch (wrong_next)
 196                 {
 197                 case 1:
 198                   /* A B A */
 199                   to_next[-2] = pi1;
 200                   to_next -= 1;
 201                   n_left_to_next += 1;
 202                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 203                   break;
 204
 205                 case 2:
 206                   /* A A B */
 207                   to_next -= 1;
 208                   n_left_to_next += 1;
 209                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 210                   break;
 211
 212                 case 3:
 213                   /* A B C */
 214                   to_next -= 2;
 215                   n_left_to_next += 2;
 216                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 217                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 218                   if (next0 == next1)
 219                     {
 220                       /* A B B */
 221                       vlib_put_next_frame (vm, node, next, n_left_to_next);
 222                       next = next1;
 223                       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 224                     }
 225                 }
 226             }
 227         }
 228
 229       while (n_left_from > 0 && n_left_to_next > 0)
 230         {
 231           vlib_buffer_t * p0;
 232           ip6_header_t * ip0;
 233           u32 pi0, lbi0;
 234           ip_lookup_next_t next0;
 235           load_balance_t * lb0;
 236           ip6_address_t * dst_addr0;
 237           u32 fib_index0, flow_hash_config0;
 238           const dpo_id_t *dpo0;
 239
 240           pi0 = from[0];
 241           to_next[0] = pi0;
 242
 243           p0 = vlib_get_buffer (vm, pi0);
 244
 245           ip0 = vlib_buffer_get_current (p0);
 246
 247           dst_addr0 = &ip0->dst_address;
 248
 249           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 250           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 251             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 252
 253           flow_hash_config0 =
 254               ip6_fib_get (fib_index0)->flow_hash_config;
 255
 256           lbi0 = ip6_fib_table_fwding_lookup (im, fib_index0, dst_addr0);
 257
 258           lb0 = load_balance_get (lbi0);
 259
 260           vnet_buffer (p0)->ip.flow_hash = 0;
 261
 262           if (PREDICT_FALSE(lb0->lb_n_buckets > 1))
 263             {
 264               flow_hash_config0 = lb0->lb_hash_config;
 265               vnet_buffer (p0)->ip.flow_hash =
 266                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 267             }
 268
 269           ASSERT (lb0->lb_n_buckets > 0);
 270           ASSERT (is_pow2 (lb0->lb_n_buckets));
 271           dpo0 = load_balance_get_bucket_i(lb0,
 272                                            (vnet_buffer (p0)->ip.flow_hash &
 273                                             lb0->lb_n_buckets_minus_1));
 274           next0 = dpo0->dpoi_next_node;
 275
 276           /* Only process the HBH Option Header if explicitly configured to do so */
 277           if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 278             {
 279               next0 = (dpo_is_adj(dpo0) && im->hbh_enabled) ?
 280                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 281             }
 282           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 283
 284           vlib_increment_combined_counter
 285               (cm, cpu_index, lbi0, 1,
 286                vlib_buffer_length_in_chain (vm, p0));
 287
 288           from += 1;
 289           to_next += 1;
 290           n_left_to_next -= 1;
 291           n_left_from -= 1;
 292
 293           if (PREDICT_FALSE (next0 != next))
 294             {
 295               n_left_to_next += 1;
 296               vlib_put_next_frame (vm, node, next, n_left_to_next);
 297               next = next0;
 298               vlib_get_next_frame (vm, node, next,
 299                                    to_next, n_left_to_next);
 300               to_next[0] = pi0;
 301               to_next += 1;
 302               n_left_to_next -= 1;
 303             }
 304         }
 305
 306       vlib_put_next_frame (vm, node, next, n_left_to_next);
 307     }
 308
 309   if (node->flags & VLIB_NODE_FLAG_TRACE)
 310     ip6_forward_next_trace(vm, node, frame, VLIB_TX);
 311
 312   return frame->n_vectors;
 313 }
 314
 315 static void
 316 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 317                           ip6_main_t * im, u32 fib_index,
 318                           ip_interface_address_t * a)
 319 {
 320   ip_lookup_main_t * lm = &im->lookup_main;
 321   ip6_address_t * address = ip_interface_address_get_address (lm, a);
 322   fib_prefix_t pfx = {
 323       .fp_len = a->address_length,
 324       .fp_proto = FIB_PROTOCOL_IP6,
 325       .fp_addr.ip6 = *address,
 326   };
 327
 328   a->neighbor_probe_adj_index = ~0;
 329   if (a->address_length < 128)
 330   {
 331       fib_node_index_t fei;
 332
 333       fei = fib_table_entry_update_one_path(fib_index,
 334                                             &pfx,
 335                                             FIB_SOURCE_INTERFACE,
 336                                             (FIB_ENTRY_FLAG_CONNECTED |
 337                                              FIB_ENTRY_FLAG_ATTACHED),
 338                                             FIB_PROTOCOL_IP6,
 339                                             NULL, /* No next-hop address */
 340                                             sw_if_index,
 341                                             ~0, // invalid FIB index
 342                                             1,
 343                                             MPLS_LABEL_INVALID,
 344                                             FIB_ROUTE_PATH_FLAG_NONE);
 345       a->neighbor_probe_adj_index = fib_entry_get_adj(fei);
 346   }
 347
 348   pfx.fp_len = 128;
 349   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
 350   {
 351       u32 classify_table_index =
 352           lm->classify_table_index_by_sw_if_index [sw_if_index];
 353       if (classify_table_index != (u32) ~0)
 354       {
 355           dpo_id_t dpo = DPO_INVALID;
 356
 357           dpo_set(&dpo,
 358                   DPO_CLASSIFY,
 359                   DPO_PROTO_IP6,
 360                   classify_dpo_create(DPO_PROTO_IP6, classify_table_index));
 361
 362           fib_table_entry_special_dpo_add(fib_index,
 363                                           &pfx,
 364                                           FIB_SOURCE_CLASSIFY,
 365                                           FIB_ENTRY_FLAG_NONE,
 366                                           &dpo);
 367           dpo_reset(&dpo);
 368       }
 369   }
 370
 371   fib_table_entry_update_one_path(fib_index,
 372                                   &pfx,
 373                                   FIB_SOURCE_INTERFACE,
 374                                   (FIB_ENTRY_FLAG_CONNECTED |
 375                                    FIB_ENTRY_FLAG_LOCAL),
 376                                   FIB_PROTOCOL_IP6,
 377                                   &pfx.fp_addr,
 378                                   sw_if_index,
 379                                   ~0, // invalid FIB index
 380                                   1,
 381                                   MPLS_LABEL_INVALID,
 382                                   FIB_ROUTE_PATH_FLAG_NONE);
 383 }
 384
 385 static void
 386 ip6_del_interface_routes (ip6_main_t * im,
 387                           u32 fib_index,
 388                           ip6_address_t * address,
 389                           u32 address_length)
 390 {
 391     fib_prefix_t pfx = {
 392         .fp_len = address_length,
 393         .fp_proto = FIB_PROTOCOL_IP6,
 394         .fp_addr.ip6 = *address,
 395     };
 396
 397     if (pfx.fp_len < 128)
 398     {
 399         fib_table_entry_delete(fib_index,
 400                                &pfx,
 401                                FIB_SOURCE_INTERFACE);
 402
 403     }
 404
 405     pfx.fp_len = 128;
 406     fib_table_entry_delete(fib_index,
 407                            &pfx,
 408                            FIB_SOURCE_INTERFACE);
 409 }
 410
 411 void
 412 ip6_sw_interface_enable_disable (u32 sw_if_index,
 413                                  u32 is_enable)
 414 {
 415   ip6_main_t * im = &ip6_main;
 416
 417   vec_validate_init_empty (im->ip_enabled_by_sw_if_index, sw_if_index, 0);
 418
 419   /*
 420    * enable/disable only on the 1<->0 transition
 421    */
 422   if (is_enable)
 423     {
 424       if (1 != ++im->ip_enabled_by_sw_if_index[sw_if_index])
 425         return;
 426     }
 427   else
 428     {
 429       ASSERT(im->ip_enabled_by_sw_if_index[sw_if_index] > 0);
 430       if (0 != --im->ip_enabled_by_sw_if_index[sw_if_index])
 431         return;
 432     }
 433
 434   vnet_feature_enable_disable ("ip6-unicast", "ip6-lookup", sw_if_index,
 435                                is_enable, 0, 0);
 436
 437   vnet_feature_enable_disable ("ip6-multicast", "ip6-lookup", sw_if_index,
 438                                is_enable, 0, 0);
 439
 440 }
 441
 442 /* get first interface address */
 443 ip6_address_t *
 444 ip6_interface_first_address (ip6_main_t * im,
 445                              u32 sw_if_index,
 446                              ip_interface_address_t ** result_ia)
 447 {
 448   ip_lookup_main_t * lm = &im->lookup_main;
 449   ip_interface_address_t * ia = 0;
 450   ip6_address_t * result = 0;
 451
 452   foreach_ip_interface_address (lm, ia, sw_if_index,
 453                                 1 /* honor unnumbered */,
 454   ({
 455     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 456     result = a;
 457     break;
 458   }));
 459   if (result_ia)
 460     *result_ia = result ? ia : 0;
 461   return result;
 462 }
 463
 464 clib_error_t *
 465 ip6_add_del_interface_address (vlib_main_t * vm,
 466                                u32 sw_if_index,
 467                                ip6_address_t * address,
 468                                u32 address_length,
 469                                u32 is_del)
 470 {
 471   vnet_main_t * vnm = vnet_get_main();
 472   ip6_main_t * im = &ip6_main;
 473   ip_lookup_main_t * lm = &im->lookup_main;
 474   clib_error_t * error;
 475   u32 if_address_index;
 476   ip6_address_fib_t ip6_af, * addr_fib = 0;
 477
 478   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 479   ip6_addr_fib_init (&ip6_af, address,
 480                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
 481   vec_add1 (addr_fib, ip6_af);
 482
 483   {
 484     uword elts_before = pool_elts (lm->if_address_pool);
 485
 486     error = ip_interface_address_add_del
 487       (lm,
 488        sw_if_index,
 489        addr_fib,
 490        address_length,
 491        is_del,
 492        &if_address_index);
 493     if (error)
 494       goto done;
 495
 496     /* Pool did not grow: add duplicate address. */
 497     if (elts_before == pool_elts (lm->if_address_pool))
 498       goto done;
 499   }
 500
 501   if (is_del)
 502       ip6_del_interface_routes (im, ip6_af.fib_index, address,
 503                                 address_length);
 504   else
 505       ip6_add_interface_routes (vnm, sw_if_index,
 506                                 im, ip6_af.fib_index,
 507                                 pool_elt_at_index (lm->if_address_pool, if_address_index));
 508
 509   {
 510     ip6_add_del_interface_address_callback_t * cb;
 511     vec_foreach (cb, im->add_del_interface_address_callbacks)
 512       cb->function (im, cb->function_opaque, sw_if_index,
 513                     address, address_length,
 514                     if_address_index,
 515                     is_del);
 516   }
 517
 518  done:
 519   vec_free (addr_fib);
 520   return error;
 521 }
 522
 523 clib_error_t *
 524 ip6_sw_interface_admin_up_down (vnet_main_t * vnm,
 525                                 u32 sw_if_index,
 526                                 u32 flags)
 527 {
 528   ip6_main_t * im = &ip6_main;
 529   ip_interface_address_t * ia;
 530   ip6_address_t * a;
 531   u32 is_admin_up, fib_index;
 532
 533   /* Fill in lookup tables with default table (0). */
 534   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
 535
 536   vec_validate_init_empty (im->lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
 537
 538   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
 539
 540   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
 541
 542   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
 543                                 0 /* honor unnumbered */,
 544   ({
 545     a = ip_interface_address_get_address (&im->lookup_main, ia);
 546     if (is_admin_up)
 547       ip6_add_interface_routes (vnm, sw_if_index,
 548                                 im, fib_index,
 549                                 ia);
 550     else
 551       ip6_del_interface_routes (im, fib_index,
 552                                 a, ia->address_length);
 553   }));
 554
 555   return 0;
 556 }
 557
 558 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
 559
 560 /* Built-in ip6 unicast rx feature path definition */
 561 VNET_FEATURE_ARC_INIT (ip6_unicast, static) =
 562 {
 563   .arc_name  = "ip6-unicast",
 564   .start_nodes = VNET_FEATURES ("ip6-input"),
 565   .arc_index_ptr = &ip6_main.lookup_main.ucast_feature_arc_index,
 566 };
 567
 568 VNET_FEATURE_INIT (ip6_flow_classify, static) = {
 569   .arc_name = "ip6-unicast",
 570   .node_name = "ip6-flow-classify",
 571   .runs_before = VNET_FEATURES ("ip6-inacl"),
 572 };
 573
 574 VNET_FEATURE_INIT (ip6_inacl, static) = {
 575   .arc_name = "ip6-unicast",
 576   .node_name = "ip6-inacl",
 577   .runs_before = VNET_FEATURES ("ip6-policer-classify"),
 578 };
 579
 580 VNET_FEATURE_INIT (ip6_policer_classify, static) = {
 581   .arc_name = "ip6-unicast",
 582   .node_name = "ip6-policer-classify",
 583   .runs_before = VNET_FEATURES ("ipsec-input-ip6"),
 584 };
 585
 586 VNET_FEATURE_INIT (ip6_ipsec, static) = {
 587   .arc_name = "ip6-unicast",
 588   .node_name = "ipsec-input-ip6",
 589   .runs_before = VNET_FEATURES ("l2tp-decap"),
 590 };
 591
 592 VNET_FEATURE_INIT (ip6_l2tp, static) = {
 593   .arc_name = "ip6-unicast",
 594   .node_name = "l2tp-decap",
 595   .runs_before = VNET_FEATURES ("vpath-input-ip6"),
 596 };
 597
 598 VNET_FEATURE_INIT (ip6_vpath, static) = {
 599   .arc_name = "ip6-unicast",
 600   .node_name = "vpath-input-ip6",
 601   .runs_before = VNET_FEATURES ("ip6-lookup"),
 602 };
 603
 604 VNET_FEATURE_INIT (ip6_lookup, static) = {
 605   .arc_name = "ip6-unicast",
 606   .node_name = "ip6-lookup",
 607   .runs_before = VNET_FEATURES ("ip6-drop"),
 608 };
 609
 610 VNET_FEATURE_INIT (ip6_drop, static) = {
 611   .arc_name = "ip6-unicast",
 612   .node_name = "ip6-drop",
 613   .runs_before = 0,  /*last feature*/
 614 };
 615
 616 /* Built-in ip6 multicast rx feature path definition (none now) */
 617 VNET_FEATURE_ARC_INIT (ip6_multicast, static) =
 618 {
 619   .arc_name  = "ip6-multicast",
 620   .start_nodes = VNET_FEATURES ("ip6-input"),
 621   .arc_index_ptr = &ip6_main.lookup_main.mcast_feature_arc_index,
 622 };
 623
 624 VNET_FEATURE_INIT (ip6_vpath_mc, static) = {
 625   .arc_name = "ip6-multicast",
 626   .node_name = "vpath-input-ip6",
 627   .runs_before = VNET_FEATURES ("ip6-lookup"),
 628 };
 629
 630 VNET_FEATURE_INIT (ip6_mc_lookup, static) = {
 631   .arc_name = "ip6-multicast",
 632   .node_name = "ip6-lookup",
 633   .runs_before = VNET_FEATURES ("ip6-drop"),
 634 };
 635
 636 VNET_FEATURE_INIT (ip6_drop_mc, static) = {
 637   .arc_name = "ip6-multicast",
 638   .node_name = "ip6-drop",
 639   .runs_before = 0, /* last feature */
 640 };
 641
 642 /* Built-in ip4 tx feature path definition */
 643 VNET_FEATURE_ARC_INIT (ip6_output, static) =
 644 {
 645   .arc_name  = "ip6-output",
 646   .start_nodes = VNET_FEATURES ("ip6-rewrite", "ip6-midchain"),
 647   .arc_index_ptr = &ip6_main.lookup_main.output_feature_arc_index,
 648 };
 649
 650 VNET_FEATURE_INIT (ip6_ipsec_output, static) = {
 651   .arc_name = "ip6-output",
 652   .node_name = "ipsec-output-ip6",
 653   .runs_before = VNET_FEATURES ("interface-output"),
 654 };
 655
 656 VNET_FEATURE_INIT (ip6_interface_output, static) = {
 657   .arc_name = "ip6-output",
 658   .node_name = "interface-output",
 659   .runs_before = 0, /* not before any other features */
 660 };
 661
 662 clib_error_t *
 663 ip6_sw_interface_add_del (vnet_main_t * vnm,
 664                           u32 sw_if_index,
 665                           u32 is_add)
 666 {
 667   vnet_feature_enable_disable ("ip6-unicast", "ip6-drop", sw_if_index,
 668                                is_add, 0, 0);
 669
 670   vnet_feature_enable_disable ("ip6-multicast", "ip6-drop", sw_if_index,
 671                                is_add, 0, 0);
 672
 673   vnet_feature_enable_disable ("ip6-output", "interface-output", sw_if_index,
 674                                is_add, 0, 0);
 675
 676   return /* no error */ 0;
 677 }
 678
 679 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
 680
 681 static uword
 682 ip6_lookup (vlib_main_t * vm,
 683             vlib_node_runtime_t * node,
 684             vlib_frame_t * frame)
 685 {
 686   return ip6_lookup_inline (vm, node, frame);
 687 }
 688
 689 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args);
 690
 691 VLIB_REGISTER_NODE (ip6_lookup_node) = {
 692   .function = ip6_lookup,
 693   .name = "ip6-lookup",
 694   .vector_size = sizeof (u32),
 695
 696   .format_trace = format_ip6_lookup_trace,
 697
 698   .n_next_nodes = IP6_LOOKUP_N_NEXT,
 699   .next_nodes = IP6_LOOKUP_NEXT_NODES,
 700 };
 701
 702 VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup)
 703
 704 always_inline uword
 705 ip6_load_balance (vlib_main_t * vm,
 706                   vlib_node_runtime_t * node,
 707                   vlib_frame_t * frame)
 708 {
 709   vlib_combined_counter_main_t * cm = &load_balance_main.lbm_via_counters;
 710   u32 n_left_from, n_left_to_next, * from, * to_next;
 711   ip_lookup_next_t next;
 712   u32 cpu_index = os_get_cpu_number();
 713   ip6_main_t * im = &ip6_main;
 714
 715   from = vlib_frame_vector_args (frame);
 716   n_left_from = frame->n_vectors;
 717   next = node->cached_next_index;
 718
 719   if (node->flags & VLIB_NODE_FLAG_TRACE)
 720       ip6_forward_next_trace(vm, node, frame, VLIB_TX);
 721
 722   while (n_left_from > 0)
 723     {
 724       vlib_get_next_frame (vm, node, next,
 725                            to_next, n_left_to_next);
 726
 727
 728       while (n_left_from > 0 && n_left_to_next > 0)
 729         {
 730           ip_lookup_next_t next0;
 731           const load_balance_t *lb0;
 732           vlib_buffer_t * p0;
 733           u32 pi0, lbi0, hc0;
 734           const ip6_header_t *ip0;
 735           const dpo_id_t *dpo0;
 736
 737           pi0 = from[0];
 738           to_next[0] = pi0;
 739
 740           p0 = vlib_get_buffer (vm, pi0);
 741
 742           ip0 = vlib_buffer_get_current (p0);
 743           lbi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
 744
 745           lb0 = load_balance_get(lbi0);
 746           hc0 = lb0->lb_hash_config;
 747           vnet_buffer(p0)->ip.flow_hash = ip6_compute_flow_hash(ip0, hc0);
 748
 749           dpo0 = load_balance_get_bucket_i(lb0,
 750                                            vnet_buffer(p0)->ip.flow_hash &
 751                                            (lb0->lb_n_buckets - 1));
 752           next0 = dpo0->dpoi_next_node;
 753           /* Only process the HBH Option Header if explicitly configured to do so */
 754           if (PREDICT_FALSE(ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
 755             {
 756               next0 = (dpo_is_adj(dpo0) && im->hbh_enabled) ?
 757                 (ip_lookup_next_t) IP6_LOOKUP_NEXT_HOP_BY_HOP : next0;
 758             }
 759           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
 760
 761           vlib_increment_combined_counter
 762               (cm, cpu_index, lbi0, 1,
 763                vlib_buffer_length_in_chain (vm, p0));
 764
 765           from += 1;
 766           to_next += 1;
 767           n_left_to_next -= 1;
 768           n_left_from -= 1;
 769
 770           if (PREDICT_FALSE (next0 != next))
 771             {
 772               n_left_to_next += 1;
 773               vlib_put_next_frame (vm, node, next, n_left_to_next);
 774               next = next0;
 775               vlib_get_next_frame (vm, node, next,
 776                                    to_next, n_left_to_next);
 777               to_next[0] = pi0;
 778               to_next += 1;
 779               n_left_to_next -= 1;
 780             }
 781         }
 782
 783       vlib_put_next_frame (vm, node, next, n_left_to_next);
 784     }
 785
 786   return frame->n_vectors;
 787 }
 788
 789 VLIB_REGISTER_NODE (ip6_load_balance_node) = {
 790   .function = ip6_load_balance,
 791   .name = "ip6-load-balance",
 792   .vector_size = sizeof (u32),
 793   .sibling_of = "ip6-lookup",
 794   .format_trace = format_ip6_lookup_trace,
 795   .n_next_nodes = 0,
 796 };
 797
 798 VLIB_NODE_FUNCTION_MULTIARCH (ip6_load_balance_node, ip6_load_balance)
 799
 800 typedef struct {
 801   /* Adjacency taken. */
 802   u32 adj_index;
 803   u32 flow_hash;
 804   u32 fib_index;
 805
 806   /* Packet data, possibly *after* rewrite. */
 807   u8 packet_data[128 - 1*sizeof(u32)];
 808 } ip6_forward_next_trace_t;
 809
 810 static u8 * format_ip6_forward_next_trace (u8 * s, va_list * args)
 811 {
 812   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 813   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 814   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
 815   uword indent = format_get_indent (s);
 816
 817   s = format(s, "%U%U",
 818              format_white_space, indent,
 819              format_ip6_header, t->packet_data, sizeof (t->packet_data));
 820   return s;
 821 }
 822
 823 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args)
 824 {
 825   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 826   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 827   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
 828   uword indent = format_get_indent (s);
 829
 830   s = format (s, "fib %d dpo-idx %d flow hash: 0x%08x",
 831               t->fib_index, t->adj_index, t->flow_hash);
 832   s = format(s, "\n%U%U",
 833              format_white_space, indent,
 834              format_ip6_header, t->packet_data, sizeof (t->packet_data));
 835   return s;
 836 }
 837
 838
 839 static u8 * format_ip6_rewrite_trace (u8 * s, va_list * args)
 840 {
 841   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 842   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 843   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
 844   vnet_main_t * vnm = vnet_get_main();
 845   uword indent = format_get_indent (s);
 846
 847   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
 848               t->fib_index, t->adj_index, format_ip_adjacency,
 849               t->adj_index, FORMAT_IP_ADJACENCY_NONE,
 850               t->flow_hash);
 851   s = format (s, "\n%U%U",
 852               format_white_space, indent,
 853               format_ip_adjacency_packet_data,
 854               vnm, t->adj_index,
 855               t->packet_data, sizeof (t->packet_data));
 856   return s;
 857 }
 858
 859 /* Common trace function for all ip6-forward next nodes. */
 860 void
 861 ip6_forward_next_trace (vlib_main_t * vm,
 862                         vlib_node_runtime_t * node,
 863                         vlib_frame_t * frame,
 864                         vlib_rx_or_tx_t which_adj_index)
 865 {
 866   u32 * from, n_left;
 867   ip6_main_t * im = &ip6_main;
 868
 869   n_left = frame->n_vectors;
 870   from = vlib_frame_vector_args (frame);
 871
 872   while (n_left >= 4)
 873     {
 874       u32 bi0, bi1;
 875       vlib_buffer_t * b0, * b1;
 876       ip6_forward_next_trace_t * t0, * t1;
 877
 878       /* Prefetch next iteration. */
 879       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
 880       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
 881
 882       bi0 = from[0];
 883       bi1 = from[1];
 884
 885       b0 = vlib_get_buffer (vm, bi0);
 886       b1 = vlib_get_buffer (vm, bi1);
 887
 888       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 889         {
 890           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 891           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 892           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 893           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
 894               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
 895               vec_elt (im->fib_index_by_sw_if_index,
 896                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 897
 898           clib_memcpy (t0->packet_data,
 899                   vlib_buffer_get_current (b0),
 900                   sizeof (t0->packet_data));
 901         }
 902       if (b1->flags & VLIB_BUFFER_IS_TRACED)
 903         {
 904           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 905           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
 906           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
 907           t1->fib_index = (vnet_buffer(b1)->sw_if_index[VLIB_TX] != (u32)~0) ?
 908               vnet_buffer(b1)->sw_if_index[VLIB_TX] :
 909               vec_elt (im->fib_index_by_sw_if_index,
 910                        vnet_buffer(b1)->sw_if_index[VLIB_RX]);
 911
 912           clib_memcpy (t1->packet_data,
 913                   vlib_buffer_get_current (b1),
 914                   sizeof (t1->packet_data));
 915         }
 916       from += 2;
 917       n_left -= 2;
 918     }
 919
 920   while (n_left >= 1)
 921     {
 922       u32 bi0;
 923       vlib_buffer_t * b0;
 924       ip6_forward_next_trace_t * t0;
 925
 926       bi0 = from[0];
 927
 928       b0 = vlib_get_buffer (vm, bi0);
 929
 930       if (b0->flags & VLIB_BUFFER_IS_TRACED)
 931         {
 932           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 933           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
 934           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
 935           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
 936               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
 937               vec_elt (im->fib_index_by_sw_if_index,
 938                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 939
 940           clib_memcpy (t0->packet_data,
 941                   vlib_buffer_get_current (b0),
 942                   sizeof (t0->packet_data));
 943         }
 944       from += 1;
 945       n_left -= 1;
 946     }
 947 }
 948
 949 static uword
 950 ip6_drop_or_punt (vlib_main_t * vm,
 951                   vlib_node_runtime_t * node,
 952                   vlib_frame_t * frame,
 953                   ip6_error_t error_code)
 954 {
 955   u32 * buffers = vlib_frame_vector_args (frame);
 956   uword n_packets = frame->n_vectors;
 957
 958   vlib_error_drop_buffers (vm, node,
 959                            buffers,
 960                            /* stride */ 1,
 961                            n_packets,
 962                            /* next */ 0,
 963                            ip6_input_node.index,
 964                            error_code);
 965
 966   if (node->flags & VLIB_NODE_FLAG_TRACE)
 967     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
 968
 969   return n_packets;
 970 }
 971
 972 static uword
 973 ip6_drop (vlib_main_t * vm,
 974           vlib_node_runtime_t * node,
 975           vlib_frame_t * frame)
 976 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_DROP); }
 977
 978 static uword
 979 ip6_punt (vlib_main_t * vm,
 980           vlib_node_runtime_t * node,
 981           vlib_frame_t * frame)
 982 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_PUNT); }
 983
 984 VLIB_REGISTER_NODE (ip6_drop_node,static) = {
 985   .function = ip6_drop,
 986   .name = "ip6-drop",
 987   .vector_size = sizeof (u32),
 988
 989   .format_trace = format_ip6_forward_next_trace,
 990
 991   .n_next_nodes = 1,
 992   .next_nodes = {
 993     [0] = "error-drop",
 994   },
 995 };
 996
 997 VLIB_NODE_FUNCTION_MULTIARCH (ip6_drop_node, ip6_drop)
 998
 999 VLIB_REGISTER_NODE (ip6_punt_node,static) = {
1000   .function = ip6_punt,
1001   .name = "ip6-punt",
1002   .vector_size = sizeof (u32),
1003
1004   .format_trace = format_ip6_forward_next_trace,
1005
1006   .n_next_nodes = 1,
1007   .next_nodes = {
1008     [0] = "error-punt",
1009   },
1010 };
1011
1012 VLIB_NODE_FUNCTION_MULTIARCH (ip6_punt_node, ip6_punt)
1013
1014 VLIB_REGISTER_NODE (ip6_multicast_node,static) = {
1015   .function = ip6_drop,
1016   .name = "ip6-multicast",
1017   .vector_size = sizeof (u32),
1018
1019   .format_trace = format_ip6_forward_next_trace,
1020
1021   .n_next_nodes = 1,
1022   .next_nodes = {
1023     [0] = "error-drop",
1024   },
1025 };
1026
1027 /* Compute TCP/UDP/ICMP6 checksum in software. */
1028 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp)
1029 {
1030   ip_csum_t sum0;
1031   u16 sum16, payload_length_host_byte_order;
1032   u32 i, n_this_buffer, n_bytes_left;
1033   u32 headers_size = sizeof(ip0[0]);
1034   void * data_this_buffer;
1035
1036   ASSERT(bogus_lengthp);
1037   *bogus_lengthp = 0;
1038
1039   /* Initialize checksum with ip header. */
1040   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1041   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1042   data_this_buffer = (void *) (ip0 + 1);
1043
1044   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1045     {
1046       sum0 = ip_csum_with_carry (sum0,
1047                                  clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1048       sum0 = ip_csum_with_carry (sum0,
1049                                  clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1050     }
1051
1052   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1053   if (PREDICT_FALSE (ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1054     {
1055       u32  skip_bytes;
1056       ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t  *)data_this_buffer;
1057
1058       /* validate really icmp6 next */
1059       ASSERT(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6);
1060
1061       skip_bytes = 8* (1 + ext_hdr->n_data_u64s);
1062       data_this_buffer  = (void *)((u8 *)data_this_buffer + skip_bytes);
1063
1064       payload_length_host_byte_order  -= skip_bytes;
1065       headers_size += skip_bytes;
1066    }
1067
1068   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1069 #if DPDK > 0
1070   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1071   {
1072     struct rte_mbuf *mb = rte_mbuf_from_vlib_buffer(p0);
1073     u8 nb_segs = mb->nb_segs;
1074
1075     n_this_buffer = (p0->current_length > headers_size ?
1076                      p0->current_length - headers_size : 0);
1077     while (n_bytes_left)
1078       {
1079         sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1080         n_bytes_left -= n_this_buffer;
1081
1082         mb = mb->next;
1083         nb_segs--;
1084         if ((nb_segs == 0) || (mb == 0))
1085           break;
1086
1087         data_this_buffer = rte_ctrlmbuf_data(mb);
1088         n_this_buffer = mb->data_len;
1089       }
1090     if (n_bytes_left || nb_segs)
1091       {
1092         *bogus_lengthp = 1;
1093         return 0xfefe;
1094       }
1095   }
1096   else sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1097 #else
1098   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1099     n_this_buffer = p0->current_length > headers_size  ? p0->current_length - headers_size  : 0;
1100   while (1)
1101     {
1102       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1103       n_bytes_left -= n_this_buffer;
1104       if (n_bytes_left == 0)
1105         break;
1106
1107       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
1108         {
1109           *bogus_lengthp = 1;
1110           return 0xfefe;
1111         }
1112       p0 = vlib_get_buffer (vm, p0->next_buffer);
1113       data_this_buffer = vlib_buffer_get_current (p0);
1114       n_this_buffer = p0->current_length;
1115     }
1116 #endif /* DPDK */
1117
1118   sum16 = ~ ip_csum_fold (sum0);
1119
1120   return sum16;
1121 }
1122
1123 u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1124 {
1125   ip6_header_t * ip0 = vlib_buffer_get_current (p0);
1126   udp_header_t * udp0;
1127   u16 sum16;
1128   int bogus_length;
1129
1130   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1131   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1132           || ip0->protocol == IP_PROTOCOL_ICMP6
1133           || ip0->protocol == IP_PROTOCOL_UDP
1134           || ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1135
1136   udp0 = (void *) (ip0 + 1);
1137   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1138     {
1139       p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1140                     | IP_BUFFER_L4_CHECKSUM_CORRECT);
1141       return p0->flags;
1142     }
1143
1144   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1145
1146   p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1147                 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1148
1149   return p0->flags;
1150 }
1151
1152 static uword
1153 ip6_local (vlib_main_t * vm,
1154            vlib_node_runtime_t * node,
1155            vlib_frame_t * frame)
1156 {
1157   ip6_main_t * im = &ip6_main;
1158   ip_lookup_main_t * lm = &im->lookup_main;
1159   ip_local_next_t next_index;
1160   u32 * from, * to_next, n_left_from, n_left_to_next;
1161   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
1162
1163   from = vlib_frame_vector_args (frame);
1164   n_left_from = frame->n_vectors;
1165   next_index = node->cached_next_index;
1166
1167   if (node->flags & VLIB_NODE_FLAG_TRACE)
1168     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1169
1170   while (n_left_from > 0)
1171     {
1172       vlib_get_next_frame (vm, node, next_index,
1173                            to_next, n_left_to_next);
1174
1175       while (n_left_from >= 4 && n_left_to_next >= 2)
1176         {
1177           vlib_buffer_t * p0, * p1;
1178           ip6_header_t * ip0, * ip1;
1179           udp_header_t * udp0, * udp1;
1180           u32 pi0, ip_len0, udp_len0, flags0, next0;
1181           u32 pi1, ip_len1, udp_len1, flags1, next1;
1182           i32 len_diff0, len_diff1;
1183           u8 error0, type0, good_l4_checksum0;
1184           u8 error1, type1, good_l4_checksum1;
1185
1186           pi0 = to_next[0] = from[0];
1187           pi1 = to_next[1] = from[1];
1188           from += 2;
1189           n_left_from -= 2;
1190           to_next += 2;
1191           n_left_to_next -= 2;
1192
1193           p0 = vlib_get_buffer (vm, pi0);
1194           p1 = vlib_get_buffer (vm, pi1);
1195
1196           ip0 = vlib_buffer_get_current (p0);
1197           ip1 = vlib_buffer_get_current (p1);
1198
1199           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1200           type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
1201
1202           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1203           next1 = lm->local_next_by_ip_protocol[ip1->protocol];
1204
1205           flags0 = p0->flags;
1206           flags1 = p1->flags;
1207
1208           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1209           good_l4_checksum1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1210
1211           udp0 = ip6_next_header (ip0);
1212           udp1 = ip6_next_header (ip1);
1213
1214           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1215           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1216           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP && udp1->checksum == 0;
1217
1218           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1219           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1220
1221           /* Verify UDP length. */
1222           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1223           ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
1224           udp_len0 = clib_net_to_host_u16 (udp0->length);
1225           udp_len1 = clib_net_to_host_u16 (udp1->length);
1226
1227           len_diff0 = ip_len0 - udp_len0;
1228           len_diff1 = ip_len1 - udp_len1;
1229
1230           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1231           len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
1232
1233           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1234                              && ! good_l4_checksum0
1235                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1236             {
1237               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1238               good_l4_checksum0 =
1239                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1240             }
1241           if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
1242                              && ! good_l4_checksum1
1243                              && ! (flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1244             {
1245               flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
1246               good_l4_checksum1 =
1247                 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1248             }
1249
1250           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1251
1252           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1253           error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
1254
1255           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1256           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1257           error0 = (! good_l4_checksum0
1258                     ? IP6_ERROR_UDP_CHECKSUM + type0
1259                     : error0);
1260           error1 = (! good_l4_checksum1
1261                     ? IP6_ERROR_UDP_CHECKSUM + type1
1262                     : error1);
1263
1264           /* Drop packets from unroutable hosts. */
1265           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1266           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1267               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1268               !ip6_address_is_link_local_unicast(&ip0->src_address))
1269             {
1270               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1271               error0 = (ADJ_INDEX_INVALID == src_adj_index0
1272                         ? IP6_ERROR_SRC_LOOKUP_MISS
1273                         : error0);
1274             }
1275           if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1276               type1 != IP_BUILTIN_PROTOCOL_ICMP &&
1277               !ip6_address_is_link_local_unicast(&ip1->src_address))
1278             {
1279               u32 src_adj_index1 = ip6_src_lookup_for_packet (im, p1, ip1);
1280               error1 = (ADJ_INDEX_INVALID == src_adj_index1
1281                         ? IP6_ERROR_SRC_LOOKUP_MISS
1282                         : error1);
1283             }
1284
1285           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1286           next1 = error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1287
1288           p0->error = error_node->errors[error0];
1289           p1->error = error_node->errors[error1];
1290
1291           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1292                                            to_next, n_left_to_next,
1293                                            pi0, pi1, next0, next1);
1294         }
1295
1296       while (n_left_from > 0 && n_left_to_next > 0)
1297         {
1298           vlib_buffer_t * p0;
1299           ip6_header_t * ip0;
1300           udp_header_t * udp0;
1301           u32 pi0, ip_len0, udp_len0, flags0, next0;
1302           i32 len_diff0;
1303           u8 error0, type0, good_l4_checksum0;
1304
1305           pi0 = to_next[0] = from[0];
1306           from += 1;
1307           n_left_from -= 1;
1308           to_next += 1;
1309           n_left_to_next -= 1;
1310
1311           p0 = vlib_get_buffer (vm, pi0);
1312
1313           ip0 = vlib_buffer_get_current (p0);
1314
1315           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1316           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1317
1318           flags0 = p0->flags;
1319
1320           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1321
1322           udp0 = ip6_next_header (ip0);
1323
1324           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1325           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1326
1327           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1328
1329           /* Verify UDP length. */
1330           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1331           udp_len0 = clib_net_to_host_u16 (udp0->length);
1332
1333           len_diff0 = ip_len0 - udp_len0;
1334
1335           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1336
1337           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1338                              && ! good_l4_checksum0
1339                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1340             {
1341               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1342               good_l4_checksum0 =
1343                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1344             }
1345
1346           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1347
1348           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1349
1350           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1351           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1352           error0 = (! good_l4_checksum0
1353                     ? IP6_ERROR_UDP_CHECKSUM + type0
1354                     : error0);
1355
1356           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1357           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL &&
1358               type0 != IP_BUILTIN_PROTOCOL_ICMP &&
1359               !ip6_address_is_link_local_unicast(&ip0->src_address))
1360             {
1361               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1362               error0 = (ADJ_INDEX_INVALID == src_adj_index0
1363                         ? IP6_ERROR_SRC_LOOKUP_MISS
1364                         : error0);
1365             }
1366
1367           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1368
1369           p0->error = error_node->errors[error0];
1370
1371           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1372                                            to_next, n_left_to_next,
1373                                            pi0, next0);
1374         }
1375
1376       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1377     }
1378
1379   return frame->n_vectors;
1380 }
1381
1382 VLIB_REGISTER_NODE (ip6_local_node,static) = {
1383   .function = ip6_local,
1384   .name = "ip6-local",
1385   .vector_size = sizeof (u32),
1386
1387   .format_trace = format_ip6_forward_next_trace,
1388
1389   .n_next_nodes = IP_LOCAL_N_NEXT,
1390   .next_nodes = {
1391     [IP_LOCAL_NEXT_DROP] = "error-drop",
1392     [IP_LOCAL_NEXT_PUNT] = "error-punt",
1393     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1394     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1395   },
1396 };
1397
1398 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local)
1399
1400 void ip6_register_protocol (u32 protocol, u32 node_index)
1401 {
1402   vlib_main_t * vm = vlib_get_main();
1403   ip6_main_t * im = &ip6_main;
1404   ip_lookup_main_t * lm = &im->lookup_main;
1405
1406   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1407   lm->local_next_by_ip_protocol[protocol] = vlib_node_add_next (vm, ip6_local_node.index, node_index);
1408 }
1409
1410 typedef enum {
1411   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1412   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
1413   IP6_DISCOVER_NEIGHBOR_N_NEXT,
1414 } ip6_discover_neighbor_next_t;
1415
1416 typedef enum {
1417   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
1418   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
1419   IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS,
1420 } ip6_discover_neighbor_error_t;
1421
1422 static uword
1423 ip6_discover_neighbor_inline (vlib_main_t * vm,
1424                               vlib_node_runtime_t * node,
1425                               vlib_frame_t * frame,
1426                               int is_glean)
1427 {
1428   vnet_main_t * vnm = vnet_get_main();
1429   ip6_main_t * im = &ip6_main;
1430   ip_lookup_main_t * lm = &im->lookup_main;
1431   u32 * from, * to_next_drop;
1432   uword n_left_from, n_left_to_next_drop;
1433   static f64 time_last_seed_change = -1e100;
1434   static u32 hash_seeds[3];
1435   static uword hash_bitmap[256 / BITS (uword)];
1436   f64 time_now;
1437   int bogus_length;
1438
1439   if (node->flags & VLIB_NODE_FLAG_TRACE)
1440     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1441
1442   time_now = vlib_time_now (vm);
1443   if (time_now - time_last_seed_change > 1e-3)
1444     {
1445       uword i;
1446       u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
1447                                              sizeof (hash_seeds));
1448       for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1449         hash_seeds[i] = r[i];
1450
1451       /* Mark all hash keys as been not-seen before. */
1452       for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1453         hash_bitmap[i] = 0;
1454
1455       time_last_seed_change = time_now;
1456     }
1457
1458   from = vlib_frame_vector_args (frame);
1459   n_left_from = frame->n_vectors;
1460
1461   while (n_left_from > 0)
1462     {
1463       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1464                            to_next_drop, n_left_to_next_drop);
1465
1466       while (n_left_from > 0 && n_left_to_next_drop > 0)
1467         {
1468           vlib_buffer_t * p0;
1469           ip6_header_t * ip0;
1470           u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1471           uword bm0;
1472           ip_adjacency_t * adj0;
1473           vnet_hw_interface_t * hw_if0;
1474           u32 next0;
1475
1476           pi0 = from[0];
1477
1478           p0 = vlib_get_buffer (vm, pi0);
1479
1480           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1481
1482           ip0 = vlib_buffer_get_current (p0);
1483
1484           adj0 = ip_get_adjacency (lm, adj_index0);
1485
1486           if (!is_glean)
1487             {
1488               ip0->dst_address.as_u64[0] = adj0->sub_type.nbr.next_hop.ip6.as_u64[0];
1489               ip0->dst_address.as_u64[1] = adj0->sub_type.nbr.next_hop.ip6.as_u64[1];
1490             }
1491
1492           a0 = hash_seeds[0];
1493           b0 = hash_seeds[1];
1494           c0 = hash_seeds[2];
1495
1496           sw_if_index0 = adj0->rewrite_header.sw_if_index;
1497           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
1498
1499           a0 ^= sw_if_index0;
1500           b0 ^= ip0->dst_address.as_u32[0];
1501           c0 ^= ip0->dst_address.as_u32[1];
1502
1503           hash_v3_mix32 (a0, b0, c0);
1504
1505           b0 ^= ip0->dst_address.as_u32[2];
1506           c0 ^= ip0->dst_address.as_u32[3];
1507
1508           hash_v3_finalize32 (a0, b0, c0);
1509
1510           c0 &= BITS (hash_bitmap) - 1;
1511           c0 = c0 / BITS (uword);
1512           m0 = (uword) 1 << (c0 % BITS (uword));
1513
1514           bm0 = hash_bitmap[c0];
1515           drop0 = (bm0 & m0) != 0;
1516
1517           /* Mark it as seen. */
1518           hash_bitmap[c0] = bm0 | m0;
1519
1520           from += 1;
1521           n_left_from -= 1;
1522           to_next_drop[0] = pi0;
1523           to_next_drop += 1;
1524           n_left_to_next_drop -= 1;
1525
1526           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
1527
1528           /* If the interface is link-down, drop the pkt */
1529           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
1530             drop0 = 1;
1531
1532           p0->error =
1533             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
1534                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
1535           if (drop0)
1536             continue;
1537
1538           /*
1539            * the adj has been updated to a rewrite but the node the DPO that got
1540            * us here hasn't - yet. no big deal. we'll drop while we wait.
1541            */
1542           if (IP_LOOKUP_NEXT_REWRITE == adj0->lookup_next_index)
1543             continue;
1544
1545           {
1546             u32 bi0 = 0;
1547             icmp6_neighbor_solicitation_header_t * h0;
1548             vlib_buffer_t * b0;
1549
1550             h0 = vlib_packet_template_get_packet
1551               (vm, &im->discover_neighbor_packet_template, &bi0);
1552
1553             /*
1554              * Build ethernet header.
1555              * Choose source address based on destination lookup
1556              * adjacency.
1557              */
1558             if (ip6_src_address_for_packet (lm,
1559                                             sw_if_index0,
1560                                             &h0->ip.src_address))
1561               {
1562                 /* There is no address on the interface */
1563                 p0->error = node->errors[IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS];
1564                 vlib_buffer_free(vm, &bi0, 1);
1565                 continue;
1566               }
1567
1568             /*
1569              * Destination address is a solicited node multicast address.
1570              * We need to fill in
1571              * the low 24 bits with low 24 bits of target's address.
1572              */
1573             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
1574             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
1575             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
1576
1577             h0->neighbor.target_address = ip0->dst_address;
1578
1579             clib_memcpy (h0->link_layer_option.ethernet_address,
1580                     hw_if0->hw_address, vec_len (hw_if0->hw_address));
1581
1582             /* $$$$ appears we need this; why is the checksum non-zero? */
1583             h0->neighbor.icmp.checksum = 0;
1584             h0->neighbor.icmp.checksum =
1585               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
1586                                                  &bogus_length);
1587
1588             ASSERT (bogus_length == 0);
1589
1590             vlib_buffer_copy_trace_flag (vm, p0, bi0);
1591             b0 = vlib_get_buffer (vm, bi0);
1592             vnet_buffer (b0)->sw_if_index[VLIB_TX]
1593               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
1594
1595             /* Add rewrite/encap string. */
1596             vnet_rewrite_one_header (adj0[0], h0,
1597                                      sizeof (ethernet_header_t));
1598             vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
1599
1600             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
1601
1602             vlib_set_next_frame_buffer (vm, node, next0, bi0);
1603           }
1604         }
1605
1606       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1607                            n_left_to_next_drop);
1608     }
1609
1610   return frame->n_vectors;
1611 }
1612
1613 static uword
1614 ip6_discover_neighbor (vlib_main_t * vm,
1615                        vlib_node_runtime_t * node,
1616                        vlib_frame_t * frame)
1617 {
1618     return (ip6_discover_neighbor_inline(vm, node, frame, 0));
1619 }
1620
1621 static uword
1622 ip6_glean (vlib_main_t * vm,
1623            vlib_node_runtime_t * node,
1624            vlib_frame_t * frame)
1625 {
1626     return (ip6_discover_neighbor_inline(vm, node, frame, 1));
1627 }
1628
1629 static char * ip6_discover_neighbor_error_strings[] = {
1630   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
1631   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT]
1632   = "neighbor solicitations sent",
1633   [IP6_DISCOVER_NEIGHBOR_ERROR_NO_SOURCE_ADDRESS]
1634     = "no source address for ND solicitation",
1635 };
1636
1637 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) = {
1638   .function = ip6_discover_neighbor,
1639   .name = "ip6-discover-neighbor",
1640   .vector_size = sizeof (u32),
1641
1642   .format_trace = format_ip6_forward_next_trace,
1643
1644   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
1645   .error_strings = ip6_discover_neighbor_error_strings,
1646
1647   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
1648   .next_nodes = {
1649     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
1650     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
1651   },
1652 };
1653
1654 VLIB_REGISTER_NODE (ip6_glean_node) = {
1655   .function = ip6_glean,
1656   .name = "ip6-glean",
1657   .vector_size = sizeof (u32),
1658
1659   .format_trace = format_ip6_forward_next_trace,
1660
1661   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
1662   .error_strings = ip6_discover_neighbor_error_strings,
1663
1664   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
1665   .next_nodes = {
1666     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
1667     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
1668   },
1669 };
1670
1671 clib_error_t *
1672 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index)
1673 {
1674   vnet_main_t * vnm = vnet_get_main();
1675   ip6_main_t * im = &ip6_main;
1676   icmp6_neighbor_solicitation_header_t * h;
1677   ip6_address_t * src;
1678   ip_interface_address_t * ia;
1679   ip_adjacency_t * adj;
1680   vnet_hw_interface_t * hi;
1681   vnet_sw_interface_t * si;
1682   vlib_buffer_t * b;
1683   u32 bi = 0;
1684   int bogus_length;
1685
1686   si = vnet_get_sw_interface (vnm, sw_if_index);
1687
1688   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
1689     {
1690       return clib_error_return (0, "%U: interface %U down",
1691                                 format_ip6_address, dst,
1692                                 format_vnet_sw_if_index_name, vnm,
1693                                 sw_if_index);
1694     }
1695
1696   src = ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
1697   if (! src)
1698     {
1699       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
1700       return clib_error_return
1701         (0, "no matching interface address for destination %U (interface %U)",
1702          format_ip6_address, dst,
1703          format_vnet_sw_if_index_name, vnm, sw_if_index);
1704     }
1705
1706   h = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi);
1707
1708   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
1709
1710   /* Destination address is a solicited node multicast address.  We need to fill in
1711      the low 24 bits with low 24 bits of target's address. */
1712   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
1713   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
1714   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
1715
1716   h->ip.src_address = src[0];
1717   h->neighbor.target_address = dst[0];
1718
1719   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address));
1720
1721   h->neighbor.icmp.checksum =
1722     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
1723   ASSERT(bogus_length == 0);
1724
1725   b = vlib_get_buffer (vm, bi);
1726   vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
1727
1728   /* Add encapsulation string for software interface (e.g. ethernet header). */
1729   adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
1730   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
1731   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
1732
1733   {
1734     vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
1735     u32 * to_next = vlib_frame_vector_args (f);
1736     to_next[0] = bi;
1737     f->n_vectors = 1;
1738     vlib_put_frame_to_node (vm, hi->output_node_index, f);
1739   }
1740
1741   return /* no error */ 0;
1742 }
1743
1744 typedef enum {
1745   IP6_REWRITE_NEXT_DROP,
1746   IP6_REWRITE_NEXT_ICMP_ERROR,
1747 } ip6_rewrite_next_t;
1748
1749 always_inline uword
1750 ip6_rewrite_inline (vlib_main_t * vm,
1751                     vlib_node_runtime_t * node,
1752                     vlib_frame_t * frame,
1753                     int rewrite_for_locally_received_packets,
1754                     int is_midchain)
1755 {
1756   ip_lookup_main_t * lm = &ip6_main.lookup_main;
1757   u32 * from = vlib_frame_vector_args (frame);
1758   u32 n_left_from, n_left_to_next, * to_next, next_index;
1759   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
1760   vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
1761
1762   n_left_from = frame->n_vectors;
1763   next_index = node->cached_next_index;
1764   u32 cpu_index = os_get_cpu_number();
1765
1766   while (n_left_from > 0)
1767     {
1768       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1769
1770       while (n_left_from >= 4 && n_left_to_next >= 2)
1771         {
1772           ip_adjacency_t * adj0, * adj1;
1773           vlib_buffer_t * p0, * p1;
1774           ip6_header_t * ip0, * ip1;
1775           u32 pi0, rw_len0, next0, error0, adj_index0;
1776           u32 pi1, rw_len1, next1, error1, adj_index1;
1777           u32 tx_sw_if_index0, tx_sw_if_index1;
1778
1779           /* Prefetch next iteration. */
1780           {
1781             vlib_buffer_t * p2, * p3;
1782
1783             p2 = vlib_get_buffer (vm, from[2]);
1784             p3 = vlib_get_buffer (vm, from[3]);
1785
1786             vlib_prefetch_buffer_header (p2, LOAD);
1787             vlib_prefetch_buffer_header (p3, LOAD);
1788
1789             CLIB_PREFETCH (p2->pre_data, 32, STORE);
1790             CLIB_PREFETCH (p3->pre_data, 32, STORE);
1791
1792             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
1793             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
1794           }
1795
1796           pi0 = to_next[0] = from[0];
1797           pi1 = to_next[1] = from[1];
1798
1799           from += 2;
1800           n_left_from -= 2;
1801           to_next += 2;
1802           n_left_to_next -= 2;
1803
1804           p0 = vlib_get_buffer (vm, pi0);
1805           p1 = vlib_get_buffer (vm, pi1);
1806
1807           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
1808           adj_index1 = vnet_buffer (p1)->ip.adj_index[adj_rx_tx];
1809
1810           /* We should never rewrite a pkt using the MISS adjacency */
1811           ASSERT(adj_index0 && adj_index1);
1812
1813           ip0 = vlib_buffer_get_current (p0);
1814           ip1 = vlib_buffer_get_current (p1);
1815
1816           error0 = error1 = IP6_ERROR_NONE;
1817           next0 = next1 = IP6_REWRITE_NEXT_DROP;
1818
1819           if (! rewrite_for_locally_received_packets)
1820             {
1821               i32 hop_limit0 = ip0->hop_limit, hop_limit1 = ip1->hop_limit;
1822
1823               /* Input node should have reject packets with hop limit 0. */
1824               ASSERT (ip0->hop_limit > 0);
1825               ASSERT (ip1->hop_limit > 0);
1826
1827               hop_limit0 -= 1;
1828               hop_limit1 -= 1;
1829
1830               ip0->hop_limit = hop_limit0;
1831               ip1->hop_limit = hop_limit1;
1832
1833               /*
1834                * If the hop count drops below 1 when forwarding, generate
1835                * an ICMP response.
1836                */
1837               if (PREDICT_FALSE(hop_limit0 <= 0))
1838                 {
1839                   error0 = IP6_ERROR_TIME_EXPIRED;
1840                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1841                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32)~0;
1842                   icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
1843                         ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
1844                 }
1845               if (PREDICT_FALSE(hop_limit1 <= 0))
1846                 {
1847                   error1 = IP6_ERROR_TIME_EXPIRED;
1848                   next1 = IP6_REWRITE_NEXT_ICMP_ERROR;
1849                   vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32)~0;
1850                   icmp6_error_set_vnet_buffer(p1, ICMP6_time_exceeded,
1851                         ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
1852                 }
1853             }
1854
1855           adj0 = ip_get_adjacency (lm, adj_index0);
1856           adj1 = ip_get_adjacency (lm, adj_index1);
1857
1858           rw_len0 = adj0[0].rewrite_header.data_bytes;
1859           rw_len1 = adj1[0].rewrite_header.data_bytes;
1860           vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
1861           vnet_buffer(p1)->ip.save_rewrite_length = rw_len1;
1862
1863           vlib_increment_combined_counter (&adjacency_counters,
1864                                            cpu_index,
1865                                            adj_index0,
1866                                            /* packet increment */ 0,
1867                                            /* byte increment */ rw_len0);
1868           vlib_increment_combined_counter (&adjacency_counters,
1869                                            cpu_index,
1870                                            adj_index1,
1871                                            /* packet increment */ 0,
1872                                            /* byte increment */ rw_len1);
1873
1874           /* Check MTU of outgoing interface. */
1875           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
1876                     ? IP6_ERROR_MTU_EXCEEDED
1877                     : error0);
1878           error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0].rewrite_header.max_l3_packet_bytes
1879                     ? IP6_ERROR_MTU_EXCEEDED
1880                     : error1);
1881
1882           /* Don't adjust the buffer for hop count issue; icmp-error node
1883            * wants to see the IP headerr */
1884           if (PREDICT_TRUE(error0 == IP6_ERROR_NONE))
1885             {
1886               p0->current_data -= rw_len0;
1887               p0->current_length += rw_len0;
1888
1889               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
1890               vnet_buffer (p0)->sw_if_index[VLIB_TX] =
1891                   tx_sw_if_index0;
1892               next0 = adj0[0].rewrite_header.next_index;
1893
1894               vnet_feature_arc_start(lm->output_feature_arc_index,
1895                                      tx_sw_if_index0, &next0, p0);
1896             }
1897           if (PREDICT_TRUE(error1 == IP6_ERROR_NONE))
1898             {
1899               p1->current_data -= rw_len1;
1900               p1->current_length += rw_len1;
1901
1902               tx_sw_if_index1 = adj1[0].rewrite_header.sw_if_index;
1903               vnet_buffer (p1)->sw_if_index[VLIB_TX] =
1904                   tx_sw_if_index1;
1905               next1 = adj1[0].rewrite_header.next_index;
1906
1907               vnet_feature_arc_start(lm->output_feature_arc_index,
1908                                      tx_sw_if_index1, &next1, p1);
1909             }
1910
1911           /* Guess we are only writing on simple Ethernet header. */
1912           vnet_rewrite_two_headers (adj0[0], adj1[0],
1913                                     ip0, ip1,
1914                                     sizeof (ethernet_header_t));
1915
1916           if (is_midchain)
1917           {
1918               adj0->sub_type.midchain.fixup_func(vm, adj0, p0);
1919               adj1->sub_type.midchain.fixup_func(vm, adj1, p1);
1920           }
1921
1922           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1923                                            to_next, n_left_to_next,
1924                                            pi0, pi1, next0, next1);
1925         }
1926
1927       while (n_left_from > 0 && n_left_to_next > 0)
1928         {
1929           ip_adjacency_t * adj0;
1930           vlib_buffer_t * p0;
1931           ip6_header_t * ip0;
1932           u32 pi0, rw_len0;
1933           u32 adj_index0, next0, error0;
1934           u32 tx_sw_if_index0;
1935
1936           pi0 = to_next[0] = from[0];
1937
1938           p0 = vlib_get_buffer (vm, pi0);
1939
1940           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
1941
1942           /* We should never rewrite a pkt using the MISS adjacency */
1943           ASSERT(adj_index0);
1944
1945           adj0 = ip_get_adjacency (lm, adj_index0);
1946
1947           ip0 = vlib_buffer_get_current (p0);
1948
1949           error0 = IP6_ERROR_NONE;
1950           next0 = IP6_REWRITE_NEXT_DROP;
1951
1952           /* Check hop limit */
1953           if (! rewrite_for_locally_received_packets)
1954             {
1955               i32 hop_limit0 = ip0->hop_limit;
1956
1957               ASSERT (ip0->hop_limit > 0);
1958
1959               hop_limit0 -= 1;
1960
1961               ip0->hop_limit = hop_limit0;
1962
1963               if (PREDICT_FALSE(hop_limit0 <= 0))
1964                 {
1965                   /*
1966                    * If the hop count drops below 1 when forwarding, generate
1967                    * an ICMP response.
1968                    */
1969                   error0 = IP6_ERROR_TIME_EXPIRED;
1970                   next0 = IP6_REWRITE_NEXT_ICMP_ERROR;
1971                   vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32)~0;
1972                   icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
1973                         ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
1974                 }
1975             }
1976
1977           /* Guess we are only writing on simple Ethernet header. */
1978           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
1979
1980           /* Update packet buffer attributes/set output interface. */
1981           rw_len0 = adj0[0].rewrite_header.data_bytes;
1982           vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
1983
1984           vlib_increment_combined_counter (&adjacency_counters,
1985                                            cpu_index,
1986                                            adj_index0,
1987                                            /* packet increment */ 0,
1988                                            /* byte increment */ rw_len0);
1989
1990           /* Check MTU of outgoing interface. */
1991           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
1992                     ? IP6_ERROR_MTU_EXCEEDED
1993                     : error0);
1994
1995           /* Don't adjust the buffer for hop count issue; icmp-error node
1996            * wants to see the IP headerr */
1997           if (PREDICT_TRUE(error0 == IP6_ERROR_NONE))
1998             {
1999               p0->current_data -= rw_len0;
2000               p0->current_length += rw_len0;
2001
2002               tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
2003
2004               vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
2005               next0 = adj0[0].rewrite_header.next_index;
2006
2007               vnet_feature_arc_start(lm->output_feature_arc_index,
2008                                      tx_sw_if_index0, &next0, p0);
2009             }
2010
2011           if (is_midchain)
2012           {
2013               adj0->sub_type.midchain.fixup_func(vm, adj0, p0);
2014           }
2015
2016           p0->error = error_node->errors[error0];
2017
2018           from += 1;
2019           n_left_from -= 1;
2020           to_next += 1;
2021           n_left_to_next -= 1;
2022
2023           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2024                                            to_next, n_left_to_next,
2025                                            pi0, next0);
2026         }
2027
2028       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2029     }
2030
2031   /* Need to do trace after rewrites to pick up new packet data. */
2032   if (node->flags & VLIB_NODE_FLAG_TRACE)
2033     ip6_forward_next_trace (vm, node, frame, adj_rx_tx);
2034
2035   return frame->n_vectors;
2036 }
2037
2038 static uword
2039 ip6_rewrite_transit (vlib_main_t * vm,
2040                      vlib_node_runtime_t * node,
2041                      vlib_frame_t * frame)
2042 {
2043   return ip6_rewrite_inline (vm, node, frame,
2044                              /* rewrite_for_locally_received_packets */ 0,
2045                              /* midchain */ 0);
2046 }
2047
2048 static uword
2049 ip6_rewrite_local (vlib_main_t * vm,
2050                    vlib_node_runtime_t * node,
2051                    vlib_frame_t * frame)
2052 {
2053   return ip6_rewrite_inline (vm, node, frame,
2054                              /* rewrite_for_locally_received_packets */ 1,
2055                              /* midchain */ 0);
2056 }
2057
2058 static uword
2059 ip6_midchain (vlib_main_t * vm,
2060               vlib_node_runtime_t * node,
2061               vlib_frame_t * frame)
2062 {
2063   return ip6_rewrite_inline (vm, node, frame,
2064                              /* rewrite_for_locally_received_packets */ 0,
2065                              /* midchain */ 1);
2066 }
2067
2068 VLIB_REGISTER_NODE (ip6_midchain_node) = {
2069   .function = ip6_midchain,
2070   .name = "ip6-midchain",
2071   .vector_size = sizeof (u32),
2072
2073   .format_trace = format_ip6_forward_next_trace,
2074
2075   .sibling_of = "ip6-rewrite",
2076 };
2077
2078 VLIB_NODE_FUNCTION_MULTIARCH (ip6_midchain_node, ip6_midchain)
2079
2080 VLIB_REGISTER_NODE (ip6_rewrite_node) = {
2081   .function = ip6_rewrite_transit,
2082   .name = "ip6-rewrite",
2083   .vector_size = sizeof (u32),
2084
2085   .format_trace = format_ip6_rewrite_trace,
2086
2087   .n_next_nodes = 2,
2088   .next_nodes = {
2089     [IP6_REWRITE_NEXT_DROP] = "error-drop",
2090     [IP6_REWRITE_NEXT_ICMP_ERROR] = "ip6-icmp-error",
2091   },
2092 };
2093
2094 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite_transit);
2095
2096 VLIB_REGISTER_NODE (ip6_rewrite_local_node) = {
2097   .function = ip6_rewrite_local,
2098   .name = "ip6-rewrite-local",
2099   .vector_size = sizeof (u32),
2100
2101   .sibling_of = "ip6-rewrite",
2102
2103   .format_trace = format_ip6_rewrite_trace,
2104
2105   .n_next_nodes = 0,
2106 };
2107
2108 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_local_node, ip6_rewrite_local);
2109
2110 /*
2111  * Hop-by-Hop handling
2112  */
2113
2114 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2115
2116 #define foreach_ip6_hop_by_hop_error \
2117 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2118 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2119 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2120
2121 typedef enum {
2122 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2123   foreach_ip6_hop_by_hop_error
2124 #undef _
2125   IP6_HOP_BY_HOP_N_ERROR,
2126 } ip6_hop_by_hop_error_t;
2127
2128 /*
2129  * Primary h-b-h handler trace support
2130  * We work pretty hard on the problem for obvious reasons
2131  */
2132 typedef struct {
2133   u32 next_index;
2134   u32 trace_len;
2135   u8 option_data[256];
2136 } ip6_hop_by_hop_trace_t;
2137
2138 vlib_node_registration_t ip6_hop_by_hop_node;
2139
2140 static char * ip6_hop_by_hop_error_strings[] = {
2141 #define _(sym,string) string,
2142   foreach_ip6_hop_by_hop_error
2143 #undef _
2144 };
2145
2146 static u8 *
2147 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2148 {
2149   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2150   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2151   ip6_hop_by_hop_trace_t * t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2152   ip6_hop_by_hop_header_t *hbh0;
2153   ip6_hop_by_hop_option_t *opt0, *limit0;
2154   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2155
2156   u8 type0;
2157
2158   hbh0 = (ip6_hop_by_hop_header_t *)t->option_data;
2159
2160   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2161               t->next_index, (hbh0->length+1)<<3, t->trace_len);
2162
2163   opt0 = (ip6_hop_by_hop_option_t *) (hbh0+1);
2164   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *)hbh0) + t->trace_len;
2165
2166   while (opt0 < limit0) {
2167     type0 = opt0->type;
2168     switch (type0) {
2169     case 0: /* Pad, just stop */
2170       opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
2171       break;
2172
2173     default:
2174       if (hm->trace[type0]) {
2175         s = (*hm->trace[type0])(s, opt0);
2176       } else {
2177         s = format (s, "\n    unrecognized option %d length %d", type0, opt0->length);
2178       }
2179       opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
2180       break;
2181     }
2182   }
2183   return s;
2184 }
2185
2186 always_inline u8 ip6_scan_hbh_options (
2187                                        vlib_buffer_t * b0,
2188                                        ip6_header_t *ip0,
2189                                        ip6_hop_by_hop_header_t *hbh0,
2190                                        ip6_hop_by_hop_option_t *opt0,
2191                                        ip6_hop_by_hop_option_t *limit0,
2192                                        u32 *next0)
2193 {
2194   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2195   u8 type0;
2196   u8 error0 = 0;
2197
2198   while (opt0 < limit0)
2199     {
2200       type0 = opt0->type;
2201       switch (type0)
2202         {
2203         case 0: /* Pad1 */
2204           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
2205           continue;
2206         case 1: /* PadN */
2207           break;
2208         default:
2209           if (hm->options[type0])
2210             {
2211               if ((*hm->options[type0])(b0, ip0, opt0) < 0)
2212                 {
2213                   error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2214                   return(error0);
2215                 }
2216             }
2217           else
2218             {
2219               /* Unrecognized mandatory option, check the two high order bits */
2220               switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS)
2221                 {
2222                 case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2223                   break;
2224                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2225                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2226                   *next0 = IP_LOOKUP_NEXT_DROP;
2227                   break;
2228                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2229                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2230                   *next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2231                   icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
2232                                               ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
2233                   break;
2234                 case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2235                   error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2236                   if (!ip6_address_is_multicast(&ip0->dst_address))
2237                     {
2238                       *next0 =  IP_LOOKUP_NEXT_ICMP_ERROR;
2239                       icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
2240                                                   ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
2241                     }
2242                   else
2243                     {
2244                       *next0 =  IP_LOOKUP_NEXT_DROP;
2245                     }
2246                   break;
2247                 }
2248               return(error0);
2249             }
2250         }
2251       opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
2252     }
2253   return(error0);
2254 }
2255
2256 /*
2257  * Process the Hop-by-Hop Options header
2258  */
2259 static uword
2260 ip6_hop_by_hop (vlib_main_t * vm,
2261                 vlib_node_runtime_t * node,
2262                 vlib_frame_t * frame)
2263 {
2264   vlib_node_runtime_t *error_node = vlib_node_get_runtime(vm, ip6_hop_by_hop_node.index);
2265   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2266   u32 n_left_from, *from, *to_next;
2267   ip_lookup_next_t next_index;
2268   ip6_main_t * im = &ip6_main;
2269   ip_lookup_main_t *lm = &im->lookup_main;
2270
2271   from = vlib_frame_vector_args (frame);
2272   n_left_from = frame->n_vectors;
2273   next_index = node->cached_next_index;
2274
2275   while (n_left_from > 0) {
2276     u32 n_left_to_next;
2277
2278     vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2279
2280     while (n_left_from >= 4 && n_left_to_next >= 2) {
2281       u32 bi0, bi1;
2282       vlib_buffer_t * b0, *b1;
2283       u32 next0, next1;
2284       ip6_header_t * ip0, *ip1;
2285       ip6_hop_by_hop_header_t *hbh0, *hbh1;
2286       ip6_hop_by_hop_option_t *opt0, *limit0, *opt1, *limit1;
2287       u8 error0 = 0, error1 = 0;
2288
2289       /* Prefetch next iteration. */
2290       {
2291         vlib_buffer_t * p2, * p3;
2292
2293         p2 = vlib_get_buffer (vm, from[2]);
2294         p3 = vlib_get_buffer (vm, from[3]);
2295
2296         vlib_prefetch_buffer_header (p2, LOAD);
2297         vlib_prefetch_buffer_header (p3, LOAD);
2298
2299         CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
2300         CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
2301       }
2302
2303       /* Speculatively enqueue b0, b1 to the current next frame */
2304       to_next[0] = bi0 = from[0];
2305       to_next[1] = bi1 = from[1];
2306       from += 2;
2307       to_next += 2;
2308       n_left_from -= 2;
2309       n_left_to_next -= 2;
2310
2311       b0 = vlib_get_buffer (vm, bi0);
2312       b1 = vlib_get_buffer (vm, bi1);
2313
2314       /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2315       u32 adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
2316       ip_adjacency_t *adj0 = ip_get_adjacency(lm, adj_index0);
2317       u32 adj_index1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
2318       ip_adjacency_t *adj1 = ip_get_adjacency(lm, adj_index1);
2319
2320       /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2321       next0 = adj0->lookup_next_index;
2322       next1 = adj1->lookup_next_index;
2323
2324       ip0 = vlib_buffer_get_current (b0);
2325       ip1 = vlib_buffer_get_current (b1);
2326       hbh0 = (ip6_hop_by_hop_header_t *)(ip0+1);
2327       hbh1 = (ip6_hop_by_hop_header_t *)(ip1+1);
2328       opt0 = (ip6_hop_by_hop_option_t *)(hbh0+1);
2329       opt1 = (ip6_hop_by_hop_option_t *)(hbh1+1);
2330       limit0 = (ip6_hop_by_hop_option_t *)((u8 *)hbh0 + ((hbh0->length + 1) << 3));
2331       limit1 = (ip6_hop_by_hop_option_t *)((u8 *)hbh1 + ((hbh1->length + 1) << 3));
2332
2333       /*
2334        * Basic validity checks
2335        */
2336       if ((hbh0->length + 1) << 3 > clib_net_to_host_u16(ip0->payload_length)) {
2337         error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2338         next0 = IP_LOOKUP_NEXT_DROP;
2339         goto outdual;
2340       }
2341       /* Scan the set of h-b-h options, process ones that we understand */
2342       error0 = ip6_scan_hbh_options(b0, ip0, hbh0, opt0, limit0, &next0);
2343
2344       if ((hbh1->length + 1) << 3 > clib_net_to_host_u16(ip1->payload_length)) {
2345         error1 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2346         next1 = IP_LOOKUP_NEXT_DROP;
2347         goto outdual;
2348       }
2349       /* Scan the set of h-b-h options, process ones that we understand */
2350       error1 = ip6_scan_hbh_options(b1,ip1,hbh1,opt1,limit1, &next1);
2351
2352     outdual:
2353       /* Has the classifier flagged this buffer for special treatment? */
2354       if (PREDICT_FALSE((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index & OI_DECAP)))
2355         next0 = hm->next_override;
2356
2357       /* Has the classifier flagged this buffer for special treatment? */
2358       if (PREDICT_FALSE((error1 == 0) && (vnet_buffer(b1)->l2_classify.opaque_index & OI_DECAP)))
2359         next1 = hm->next_override;
2360
2361       if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)))
2362         {
2363           if (b0->flags & VLIB_BUFFER_IS_TRACED) {
2364             ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
2365             u32 trace_len = (hbh0->length + 1) << 3;
2366             t->next_index = next0;
2367             /* Capture the h-b-h option verbatim */
2368             trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2369             t->trace_len = trace_len;
2370             clib_memcpy(t->option_data, hbh0, trace_len);
2371           }
2372           if (b1->flags & VLIB_BUFFER_IS_TRACED) {
2373             ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b1, sizeof (*t));
2374             u32 trace_len = (hbh1->length + 1) << 3;
2375             t->next_index = next1;
2376             /* Capture the h-b-h option verbatim */
2377             trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2378             t->trace_len = trace_len;
2379             clib_memcpy(t->option_data, hbh1, trace_len);
2380           }
2381
2382         }
2383
2384       b0->error = error_node->errors[error0];
2385       b1->error = error_node->errors[error1];
2386
2387       /* verify speculative enqueue, maybe switch current next frame */
2388       vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0,
2389                                        bi1,next0, next1);
2390     }
2391
2392     while (n_left_from > 0 && n_left_to_next > 0) {
2393       u32 bi0;
2394       vlib_buffer_t * b0;
2395       u32 next0;
2396       ip6_header_t * ip0;
2397       ip6_hop_by_hop_header_t *hbh0;
2398       ip6_hop_by_hop_option_t *opt0, *limit0;
2399       u8 error0 = 0;
2400
2401       /* Speculatively enqueue b0 to the current next frame */
2402       bi0 = from[0];
2403       to_next[0] = bi0;
2404       from += 1;
2405       to_next += 1;
2406       n_left_from -= 1;
2407       n_left_to_next -= 1;
2408
2409       b0 = vlib_get_buffer (vm, bi0);
2410       /*
2411        * Default use the next_index from the adjacency.
2412        * A HBH option rarely redirects to a different node
2413        */
2414       u32 adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
2415       ip_adjacency_t *adj0 = ip_get_adjacency(lm, adj_index0);
2416       next0 = adj0->lookup_next_index;
2417
2418       ip0 = vlib_buffer_get_current (b0);
2419       hbh0 = (ip6_hop_by_hop_header_t *)(ip0+1);
2420       opt0 = (ip6_hop_by_hop_option_t *)(hbh0+1);
2421       limit0 = (ip6_hop_by_hop_option_t *)((u8 *)hbh0 + ((hbh0->length + 1) << 3));
2422
2423       /*
2424        * Basic validity checks
2425        */
2426       if ((hbh0->length + 1) << 3 > clib_net_to_host_u16(ip0->payload_length)) {
2427         error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2428         next0 = IP_LOOKUP_NEXT_DROP;
2429         goto out0;
2430       }
2431
2432       /* Scan the set of h-b-h options, process ones that we understand */
2433       error0 = ip6_scan_hbh_options(b0, ip0, hbh0, opt0, limit0, &next0);
2434
2435     out0:
2436       /* Has the classifier flagged this buffer for special treatment? */
2437     if (PREDICT_FALSE((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index & OI_DECAP)))
2438         next0 = hm->next_override;
2439
2440       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
2441         ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
2442         u32 trace_len = (hbh0->length + 1) << 3;
2443         t->next_index = next0;
2444         /* Capture the h-b-h option verbatim */
2445         trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2446         t->trace_len = trace_len;
2447         clib_memcpy(t->option_data, hbh0, trace_len);
2448       }
2449
2450       b0->error = error_node->errors[error0];
2451
2452       /* verify speculative enqueue, maybe switch current next frame */
2453       vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0);
2454     }
2455     vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2456   }
2457   return frame->n_vectors;
2458 }
2459
2460 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) = {
2461   .function = ip6_hop_by_hop,
2462   .name = "ip6-hop-by-hop",
2463   .sibling_of = "ip6-lookup",
2464   .vector_size = sizeof (u32),
2465   .format_trace = format_ip6_hop_by_hop_trace,
2466   .type = VLIB_NODE_TYPE_INTERNAL,
2467   .n_errors = ARRAY_LEN(ip6_hop_by_hop_error_strings),
2468   .error_strings = ip6_hop_by_hop_error_strings,
2469   .n_next_nodes = 0,
2470 };
2471
2472 VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop);
2473
2474 static clib_error_t *
2475 ip6_hop_by_hop_init (vlib_main_t * vm)
2476 {
2477   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2478   memset(hm->options, 0, sizeof(hm->options));
2479   memset(hm->trace, 0, sizeof(hm->trace));
2480   hm->next_override = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2481   return (0);
2482 }
2483
2484 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2485
2486 void ip6_hbh_set_next_override (uword next)
2487 {
2488   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2489
2490   hm->next_override = next;
2491 }
2492
2493 int
2494 ip6_hbh_register_option (u8 option,
2495                          int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
2496                          u8 *trace(u8 *s, ip6_hop_by_hop_option_t *opt))
2497 {
2498   ip6_main_t * im = &ip6_main;
2499   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2500
2501   ASSERT (option < ARRAY_LEN (hm->options));
2502
2503   /* Already registered */
2504   if (hm->options[option])
2505     return (-1);
2506
2507   hm->options[option] = options;
2508   hm->trace[option] = trace;
2509
2510   /* Set global variable */
2511   im->hbh_enabled = 1;
2512
2513   return (0);
2514 }
2515
2516 int
2517 ip6_hbh_unregister_option (u8 option)
2518 {
2519   ip6_main_t * im = &ip6_main;
2520   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2521
2522   ASSERT (option < ARRAY_LEN (hm->options));
2523
2524   /* Not registered */
2525   if (!hm->options[option])
2526     return (-1);
2527
2528   hm->options[option] = NULL;
2529   hm->trace[option] = NULL;
2530
2531   /* Disable global knob if this was the last option configured */
2532   int i;
2533   bool found = false;
2534   for (i = 0; i < 256; i++) {
2535     if (hm->options[option]) {
2536       found = true;
2537       break;
2538     }
2539   }
2540   if (!found)
2541     im->hbh_enabled = 0;
2542
2543   return (0);
2544 }
2545
2546 /* Global IP6 main. */
2547 ip6_main_t ip6_main;
2548
2549 static clib_error_t *
2550 ip6_lookup_init (vlib_main_t * vm)
2551 {
2552   ip6_main_t * im = &ip6_main;
2553   clib_error_t * error;
2554   uword i;
2555
2556   if ((error = vlib_call_init_function (vm, vnet_feature_init)))
2557     return error;
2558
2559   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2560     {
2561       u32 j, i0, i1;
2562
2563       i0 = i / 32;
2564       i1 = i % 32;
2565
2566       for (j = 0; j < i0; j++)
2567         im->fib_masks[i].as_u32[j] = ~0;
2568
2569       if (i1)
2570         im->fib_masks[i].as_u32[i0] = clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2571     }
2572
2573   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2574
2575   if (im->lookup_table_nbuckets == 0)
2576     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2577
2578   im->lookup_table_nbuckets = 1<< max_log2 (im->lookup_table_nbuckets);
2579
2580   if (im->lookup_table_size == 0)
2581     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2582
2583   BV(clib_bihash_init) (&(im->ip6_table[IP6_FIB_TABLE_FWDING].ip6_hash),
2584                         "ip6 FIB fwding table",
2585                         im->lookup_table_nbuckets,
2586                         im->lookup_table_size);
2587   BV(clib_bihash_init) (&im->ip6_table[IP6_FIB_TABLE_NON_FWDING].ip6_hash,
2588                         "ip6 FIB non-fwding table",
2589                         im->lookup_table_nbuckets,
2590                         im->lookup_table_size);
2591
2592   /* Create FIB with index 0 and table id of 0. */
2593   fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6, 0);
2594
2595   {
2596     pg_node_t * pn;
2597     pn = pg_get_node (ip6_lookup_node.index);
2598     pn->unformat_edit = unformat_pg_ip6_header;
2599   }
2600
2601   /* Unless explicitly configured, don't process HBH options */
2602   im->hbh_enabled = 0;
2603
2604   {
2605     icmp6_neighbor_solicitation_header_t p;
2606
2607     memset (&p, 0, sizeof (p));
2608
2609     p.ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2610     p.ip.payload_length = clib_host_to_net_u16 (sizeof (p)
2611                                                 - STRUCT_OFFSET_OF (icmp6_neighbor_solicitation_header_t, neighbor));
2612     p.ip.protocol = IP_PROTOCOL_ICMP6;
2613     p.ip.hop_limit = 255;
2614     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2615
2616     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2617
2618     p.link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2619     p.link_layer_option.header.n_data_u64s = sizeof (p.link_layer_option) / sizeof (u64);
2620
2621     vlib_packet_template_init (vm,
2622                                &im->discover_neighbor_packet_template,
2623                                &p, sizeof (p),
2624                                /* alloc chunk size */ 8,
2625                                "ip6 neighbor discovery");
2626   }
2627
2628   return error;
2629 }
2630
2631 VLIB_INIT_FUNCTION (ip6_lookup_init);
2632
2633 static clib_error_t *
2634 add_del_ip6_interface_table (vlib_main_t * vm,
2635                              unformat_input_t * input,
2636                              vlib_cli_command_t * cmd)
2637 {
2638   vnet_main_t * vnm = vnet_get_main();
2639   clib_error_t * error = 0;
2640   u32 sw_if_index, table_id;
2641
2642   sw_if_index = ~0;
2643
2644   if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2645     {
2646       error = clib_error_return (0, "unknown interface `%U'",
2647                                  format_unformat_error, input);
2648       goto done;
2649     }
2650
2651   if (unformat (input, "%d", &table_id))
2652     ;
2653   else
2654     {
2655       error = clib_error_return (0, "expected table id `%U'",
2656                                  format_unformat_error, input);
2657       goto done;
2658     }
2659
2660   {
2661     u32 fib_index = fib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6,
2662                                                       table_id);
2663
2664     vec_validate (ip6_main.fib_index_by_sw_if_index, sw_if_index);
2665     ip6_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
2666   }
2667
2668
2669  done:
2670   return error;
2671 }
2672
2673 /*?
2674  * Place the indicated interface into the supplied IPv6 FIB table (also known
2675  * as a VRF). If the FIB table does not exist, this command creates it. To
2676  * display the current IPv6 FIB table, use the command '<em>show ip6 fib</em>'.
2677  * FIB table will only be displayed if a route has been added to the table, or
2678  * an IP Address is assigned to an interface in the table (which adds a route
2679  * automatically).
2680  *
2681  * @note IP addresses added after setting the interface IP table end up in
2682  * the indicated FIB table. If the IP address is added prior to adding the
2683  * interface to the FIB table, it will NOT be part of the FIB table. Predictable
2684  * but potentially counter-intuitive results occur if you provision interface
2685  * addresses in multiple FIBs. Upon RX, packets will be processed in the last
2686  * IP table ID provisioned. It might be marginally useful to evade source RPF
2687  * drops to put an interface address into multiple FIBs.
2688  *
2689  * @cliexpar
2690  * Example of how to add an interface to an IPv6 FIB table (where 2 is the table-id):
2691  * @cliexcmd{set interface ip6 table GigabitEthernet2/0/0 2}
2692  ?*/
2693 /* *INDENT-OFF* */
2694 VLIB_CLI_COMMAND (set_interface_ip6_table_command, static) = {
2695   .path = "set interface ip6 table",
2696   .function = add_del_ip6_interface_table,
2697   .short_help = "set interface ip6 table <interface> <table-id>"
2698 };
2699 /* *INDENT-ON* */
2700
2701 void
2702 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
2703                                                   u8 *mac)
2704 {
2705   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2706   /* Invert the "u" bit */
2707   ip->as_u8 [8] = mac[0] ^ (1<<1);
2708   ip->as_u8 [9] = mac[1];
2709   ip->as_u8 [10] = mac[2];
2710   ip->as_u8 [11] = 0xFF;
2711   ip->as_u8 [12] = 0xFE;
2712   ip->as_u8 [13] = mac[3];
2713   ip->as_u8 [14] = mac[4];
2714   ip->as_u8 [15] = mac[5];
2715 }
2716
2717 void
2718 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
2719                                                   ip6_address_t *ip)
2720 {
2721   /* Invert the previously inverted "u" bit */
2722   mac[0] = ip->as_u8 [8] ^ (1<<1);
2723   mac[1] = ip->as_u8 [9];
2724   mac[2] = ip->as_u8 [10];
2725   mac[3] = ip->as_u8 [13];
2726   mac[4] = ip->as_u8 [14];
2727   mac[5] = ip->as_u8 [15];
2728 }
2729
2730 static clib_error_t *
2731 test_ip6_link_command_fn (vlib_main_t * vm,
2732                           unformat_input_t * input,
2733                           vlib_cli_command_t * cmd)
2734 {
2735   u8 mac[6];
2736   ip6_address_t _a, *a = &_a;
2737
2738   if (unformat (input, "%U", unformat_ethernet_address, mac))
2739     {
2740       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2741       vlib_cli_output (vm, "Link local address: %U",
2742                        format_ip6_address, a);
2743       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2744       vlib_cli_output (vm, "Original MAC address: %U",
2745                        format_ethernet_address, mac);
2746     }
2747
2748   return 0;
2749 }
2750
2751 /*?
2752  * This command converts the given MAC Address into an IPv6 link-local
2753  * address.
2754  *
2755  * @cliexpar
2756  * Example of how to create an IPv6 link-local address:
2757  * @cliexstart{test ip6 link 16:d9:e0:91:79:86}
2758  * Link local address: fe80::14d9:e0ff:fe91:7986
2759  * Original MAC address: 16:d9:e0:91:79:86
2760  * @cliexend
2761 ?*/
2762 /* *INDENT-OFF* */
2763 VLIB_CLI_COMMAND (test_link_command, static) = {
2764   .path = "test ip6 link",
2765   .function = test_ip6_link_command_fn,
2766   .short_help = "test ip6 link <mac-address>",
2767 };
2768 /* *INDENT-ON* */
2769
2770 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2771 {
2772   ip6_main_t * im6 = &ip6_main;
2773   ip6_fib_t * fib;
2774   uword * p = hash_get (im6->fib_index_by_table_id, table_id);
2775
2776   if (p == 0)
2777     return -1;
2778
2779   fib = ip6_fib_get (p[0]);
2780
2781   fib->flow_hash_config = flow_hash_config;
2782   return 1;
2783 }
2784
2785 static clib_error_t *
2786 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2787                               unformat_input_t * input,
2788                               vlib_cli_command_t * cmd)
2789 {
2790   int matched = 0;
2791   u32 table_id = 0;
2792   u32 flow_hash_config = 0;
2793   int rv;
2794
2795   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
2796     if (unformat (input, "table %d", &table_id))
2797       matched = 1;
2798 #define _(a,v) \
2799     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2800     foreach_flow_hash_bit
2801 #undef _
2802     else break;
2803   }
2804
2805   if (matched == 0)
2806     return clib_error_return (0, "unknown input `%U'",
2807                               format_unformat_error, input);
2808
2809   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2810   switch (rv)
2811     {
2812     case 1:
2813       break;
2814
2815     case -1:
2816       return clib_error_return (0, "no such FIB table %d", table_id);
2817
2818     default:
2819       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2820       break;
2821     }
2822
2823   return 0;
2824 }
2825
2826 /*?
2827  * Configure the set of IPv6 fields used by the flow hash.
2828  *
2829  * @cliexpar
2830  * @parblock
2831  * Example of how to set the flow hash on a given table:
2832  * @cliexcmd{set ip6 flow-hash table 8 dst sport dport proto}
2833  *
2834  * Example of display the configured flow hash:
2835  * @cliexstart{show ip6 fib}
2836  * ipv6-VRF:0, fib_index 0, flow hash: src dst sport dport proto
2837  * @::/0
2838  *   unicast-ip6-chain
2839  *   [@0]: dpo-load-balance: [index:5 buckets:1 uRPF:5 to:[0:0]]
2840  *     [0] [@0]: dpo-drop ip6
2841  * fe80::/10
2842  *   unicast-ip6-chain
2843  *   [@0]: dpo-load-balance: [index:10 buckets:1 uRPF:10 to:[0:0]]
2844  *     [0] [@2]: dpo-receive
2845  * ff02::1/128
2846  *   unicast-ip6-chain
2847  *   [@0]: dpo-load-balance: [index:8 buckets:1 uRPF:8 to:[0:0]]
2848  *     [0] [@2]: dpo-receive
2849  * ff02::2/128
2850  *   unicast-ip6-chain
2851  *   [@0]: dpo-load-balance: [index:7 buckets:1 uRPF:7 to:[0:0]]
2852  *     [0] [@2]: dpo-receive
2853  * ff02::16/128
2854  *   unicast-ip6-chain
2855  *   [@0]: dpo-load-balance: [index:9 buckets:1 uRPF:9 to:[0:0]]
2856  *     [0] [@2]: dpo-receive
2857  * ff02::1:ff00:0/104
2858  *   unicast-ip6-chain
2859  *   [@0]: dpo-load-balance: [index:6 buckets:1 uRPF:6 to:[0:0]]
2860  *     [0] [@2]: dpo-receive
2861  * ipv6-VRF:8, fib_index 1, flow hash: dst sport dport proto
2862  * @::/0
2863  *   unicast-ip6-chain
2864  *   [@0]: dpo-load-balance: [index:21 buckets:1 uRPF:20 to:[0:0]]
2865  *     [0] [@0]: dpo-drop ip6
2866  * @::a:1:1:0:4/126
2867  *   unicast-ip6-chain
2868  *   [@0]: dpo-load-balance: [index:27 buckets:1 uRPF:26 to:[0:0]]
2869  *     [0] [@4]: ipv6-glean: af_packet0
2870  * @::a:1:1:0:7/128
2871  *   unicast-ip6-chain
2872  *   [@0]: dpo-load-balance: [index:28 buckets:1 uRPF:27 to:[0:0]]
2873  *     [0] [@2]: dpo-receive: @::a:1:1:0:7 on af_packet0
2874  * fe80::/10
2875  *   unicast-ip6-chain
2876  *   [@0]: dpo-load-balance: [index:26 buckets:1 uRPF:25 to:[0:0]]
2877  *     [0] [@2]: dpo-receive
2878  * fe80::fe:3eff:fe3e:9222/128
2879  *   unicast-ip6-chain
2880  *   [@0]: dpo-load-balance: [index:29 buckets:1 uRPF:28 to:[0:0]]
2881  *     [0] [@2]: dpo-receive: fe80::fe:3eff:fe3e:9222 on af_packet0
2882  * ff02::1/128
2883  *   unicast-ip6-chain
2884  *   [@0]: dpo-load-balance: [index:24 buckets:1 uRPF:23 to:[0:0]]
2885  *     [0] [@2]: dpo-receive
2886  * ff02::2/128
2887  *   unicast-ip6-chain
2888  *   [@0]: dpo-load-balance: [index:23 buckets:1 uRPF:22 to:[0:0]]
2889  *     [0] [@2]: dpo-receive
2890  * ff02::16/128
2891  *   unicast-ip6-chain
2892  *   [@0]: dpo-load-balance: [index:25 buckets:1 uRPF:24 to:[0:0]]
2893  *     [0] [@2]: dpo-receive
2894  * ff02::1:ff00:0/104
2895  *   unicast-ip6-chain
2896  *   [@0]: dpo-load-balance: [index:22 buckets:1 uRPF:21 to:[0:0]]
2897  *     [0] [@2]: dpo-receive
2898  * @cliexend
2899  * @endparblock
2900 ?*/
2901 /* *INDENT-OFF* */
2902 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
2903     .path = "set ip6 flow-hash",
2904     .short_help =
2905     "set ip6 flow-hash table <table-id> [src] [dst] [sport] [dport] [proto] [reverse]",
2906     .function = set_ip6_flow_hash_command_fn,
2907 };
2908 /* *INDENT-ON* */
2909
2910 static clib_error_t *
2911 show_ip6_local_command_fn (vlib_main_t * vm,
2912                            unformat_input_t * input,
2913                            vlib_cli_command_t * cmd)
2914 {
2915   ip6_main_t * im = &ip6_main;
2916   ip_lookup_main_t * lm = &im->lookup_main;
2917   int i;
2918
2919   vlib_cli_output (vm, "Protocols handled by ip6_local");
2920   for (i = 0; i < ARRAY_LEN(lm->local_next_by_ip_protocol); i++)
2921     {
2922       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2923         vlib_cli_output (vm, "%d", i);
2924     }
2925   return 0;
2926 }
2927
2928
2929
2930 /*?
2931  * Display the set of protocols handled by the local IPv6 stack.
2932  *
2933  * @cliexpar
2934  * Example of how to display local protocol table:
2935  * @cliexstart{show ip6 local}
2936  * Protocols handled by ip6_local
2937  * 17
2938  * 43
2939  * 58
2940  * 115
2941  * @cliexend
2942 ?*/
2943 /* *INDENT-OFF* */
2944 VLIB_CLI_COMMAND (show_ip6_local, static) = {
2945   .path = "show ip6 local",
2946   .function = show_ip6_local_command_fn,
2947   .short_help = "show ip6 local",
2948 };
2949 /* *INDENT-ON* */
2950
2951 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2952                                  u32 table_index)
2953 {
2954   vnet_main_t * vnm = vnet_get_main();
2955   vnet_interface_main_t * im = &vnm->interface_main;
2956   ip6_main_t * ipm = &ip6_main;
2957   ip_lookup_main_t * lm = &ipm->lookup_main;
2958   vnet_classify_main_t * cm = &vnet_classify_main;
2959   ip6_address_t *if_addr;
2960
2961   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2962     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2963
2964   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2965     return VNET_API_ERROR_NO_SUCH_ENTRY;
2966
2967   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2968   lm->classify_table_index_by_sw_if_index [sw_if_index] = table_index;
2969
2970   if_addr = ip6_interface_first_address (ipm, sw_if_index, NULL);
2971
2972   if (NULL != if_addr)
2973   {
2974       fib_prefix_t pfx = {
2975           .fp_len = 128,
2976           .fp_proto = FIB_PROTOCOL_IP6,
2977           .fp_addr.ip6 = *if_addr,
2978       };
2979       u32 fib_index;
2980
2981       fib_index = fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
2982                                                       sw_if_index);
2983
2984
2985       if (table_index != (u32) ~0)
2986       {
2987           dpo_id_t dpo = DPO_INVALID;
2988
2989           dpo_set(&dpo,
2990                   DPO_CLASSIFY,
2991                   DPO_PROTO_IP6,
2992                   classify_dpo_create(DPO_PROTO_IP6,
2993                                       table_index));
2994
2995           fib_table_entry_special_dpo_add(fib_index,
2996                                           &pfx,
2997                                           FIB_SOURCE_CLASSIFY,
2998                                           FIB_ENTRY_FLAG_NONE,
2999                                           &dpo);
3000           dpo_reset(&dpo);
3001       }
3002       else
3003       {
3004           fib_table_entry_special_remove(fib_index,
3005                                          &pfx,
3006                                          FIB_SOURCE_CLASSIFY);
3007       }
3008   }
3009
3010   return 0;
3011 }
3012
3013 static clib_error_t *
3014 set_ip6_classify_command_fn (vlib_main_t * vm,
3015                              unformat_input_t * input,
3016                              vlib_cli_command_t * cmd)
3017 {
3018   u32 table_index = ~0;
3019   int table_index_set = 0;
3020   u32 sw_if_index = ~0;
3021   int rv;
3022
3023   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3024     if (unformat (input, "table-index %d", &table_index))
3025       table_index_set = 1;
3026     else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3027                        vnet_get_main(), &sw_if_index))
3028         ;
3029     else
3030         break;
3031   }
3032
3033   if (table_index_set == 0)
3034       return clib_error_return (0, "classify table-index must be specified");
3035
3036   if (sw_if_index == ~0)
3037     return clib_error_return (0, "interface / subif must be specified");
3038
3039   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3040
3041   switch (rv)
3042     {
3043     case 0:
3044       break;
3045
3046     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3047       return clib_error_return (0, "No such interface");
3048
3049     case VNET_API_ERROR_NO_SUCH_ENTRY:
3050       return clib_error_return (0, "No such classifier table");
3051     }
3052   return 0;
3053 }
3054
3055 /*?
3056  * Assign a classification table to an interface. The classification
3057  * table is created using the '<em>classify table</em>' and '<em>classify session</em>'
3058  * commands. Once the table is create, use this command to filter packets
3059  * on an interface.
3060  *
3061  * @cliexpar
3062  * Example of how to assign a classification table to an interface:
3063  * @cliexcmd{set ip6 classify intfc GigabitEthernet2/0/0 table-index 1}
3064 ?*/
3065 /* *INDENT-OFF* */
3066 VLIB_CLI_COMMAND (set_ip6_classify_command, static) = {
3067     .path = "set ip6 classify",
3068     .short_help =
3069     "set ip6 classify intfc <interface> table-index <classify-idx>",
3070     .function = set_ip6_classify_command_fn,
3071 };
3072 /* *INDENT-ON* */
3073
3074 static clib_error_t *
3075 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3076 {
3077   ip6_main_t * im = &ip6_main;
3078   uword heapsize = 0;
3079   u32 tmp;
3080   u32 nbuckets = 0;
3081
3082   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3083     if (unformat (input, "hash-buckets %d", &tmp))
3084       nbuckets = tmp;
3085     else if (unformat (input, "heap-size %dm", &tmp))
3086       heapsize = ((u64)tmp) << 20;
3087     else if (unformat (input, "heap-size %dM", &tmp))
3088       heapsize = ((u64)tmp) << 20;
3089     else if (unformat (input, "heap-size %dg", &tmp))
3090       heapsize = ((u64)tmp) << 30;
3091     else if (unformat (input, "heap-size %dG", &tmp))
3092       heapsize = ((u64)tmp) << 30;
3093     else
3094       return clib_error_return (0, "unknown input '%U'",
3095                                 format_unformat_error, input);
3096   }
3097
3098   im->lookup_table_nbuckets = nbuckets;
3099   im->lookup_table_size = heapsize;
3100
3101   return 0;
3102 }
3103
3104 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");